1 in 3 Singapore primary students are using KooBits ProblemSums to improve their maths
Primary 1
 • Numbers Up to 10 • Numbers Up to 20 … • Addition • Subtraction … • Ordinal Numbers • Shapes & Patterns • Length • Time …
Show All Topics for P1
Addition within 10
 To find total quantity after one event
 To find total quantity for two characters
 Given quantity for one character and quantity relationship, find quantity for another character
 Given quantity for one character and quantity relationship, find total quantity
 To find total quantity for two events
Addition & Subtraction within 20
 Given initial quantity, find final quantity after one addition event
 Given initial quantity, find final quantity after one subtraction event
 Given quantity for one character and quantity relationship, find total quantity
 Given quantity for one character and quantity relationship, find total quantity
 Given age for two characters, find age difference
Addition & Subtraction within 40
 Given initial quantity, find final quantity after one addition event
 Given initial quantity, find final quantity after one subtraction event
 Given quantity for one character and quantity relationship, find total quantity
 Given quantity for one character and quantity relationship, find total quantity
 Given age for two characters, find age difference
Addition & Subtraction within 100
 Given initial quantity, find final quantity after one addition event
 Given initial quantity, find final quantity after one subtraction event
 Given quantity for one character and quantity relationship, find total quantity
 Given quantity for one character and quantity relationship, find total quantity
 Given age for two characters, find age difference
Subtraction within 10
 Given initial quantity, find final quantity after one event
 Given quantiy for one character and quantity relationship, find quantity for the other character
 Given quantiy for one character and quantity relationship, find total quantity
 Given two events with lessthan relationship, find total quantity
 Given age for two characters, find age difference
Multiplication & Division
 To find the product of two numbers using the term groups
 Given quantity in each group and number of groups, find total quantity
 To find the quotient of two numbers using the term groups
 Given the total quantity and number of characters, find quantity for each character
 Given number of groups and quantity in each group, find total number after one event
Money
 To find total amount in cents
 To find total amount in dollars
 Given amount for one character and amount relationship, find total amount for two characters
 Given amount for one character and amount relationship, find total amount for two characters
 To find the difference of amount between two chracters
Numbers
 Numbers up to 10
 Numbers up to 20
 Numbers up to 40
 Numbers up to 100
 Ordinal Numbers
Geometry
 Shapes & Patterns
Statistics
 Picture Graphs
Measurement
 Length
 Time
Primary 2
 • Numbers Up to 1000 • Fractions … • Addition • Subtraction … • Models • Multiplication & Division • Length • Mass …
Show All Topics for P2
Addition
 To find total quantity in an event
 Given final amount, find initial amount for an event
 Given amount for one character and amount relationship, find total amount
 Given initial quantity and two events, find final quantity
 Given final quantity and two events, find initial quantity
Fraction
 Given one fraction, find fraction to added up to one whole
 To find the smallest or the greatest fraction in a list of fractions with the same numerator
 To find the smallest or the greatest fraction in a list of fractions with the same denominators
 To find fractions of an item after events
 Given initial quantity, quantity for one character and final fraction, find quantity for another character
 To add fractions with the same denominator
 To subtract fractions with the same denominator
Money
 To convert cents to dollars in decimal notation
 To convert dollars in decimal notation to cents
 To find sum of two amount with conversion of dollars and cents
 Given spending amount and final amount, find initial amount
 Given amount for one character and amount relationship, find total amount with dollarscents conversion
 Given total amount and single price, find quantity after an event
Multiplication & Division
 Given total number and number of groups, find quantity in each group
 Given number of groups and quantity in each group, find total quantity
 Given total quantity, number of groups and quantity in each number, find remaining quantity
 Given number of groups, amount in each group and remaining amount, find total amount
 Given single item price and quantity, find payment amount required
 Given single item price, quantity and payment amount, find change amount
 Given number of animals, find total number of legs
 Given number of different types of notes, find total amount
 Given total quantity, remaining quantity and quantity of each group, find number of groups
 Given number of groups and total quantity, find total quantity in a different number of groups
Measurement
 Length
 Mass
 Time
 Volume
Numbers
 Numbers up to 1000
Data Analysis
 Picture Graphs
Geometry
 Lines & Surfaces
 Shapes & Patterns
Models
Subtraction
 Given total quantity and one event, find final quantity
 Given initial amount and two events, find final amount
 Given quantity for one character and quantity relationship, find total quantity
 Given quantity for one character and two events, find final quantity
 Given initial quantity and final quantity, find quantity in one event
 Given quantities of two items and one event, find final quantity
 Given total quantity and quantity for one item, find quantity relationship
Primary 3
 • Addition & Subtraction • Fraction … • Area & Perimeter • Multiplication & Division • Perpendicular & Parallel Lines • Mass • Length • Volume …
Show All Topics for P3
Addition & Subtraction
 Given difference & sum of two numbers, find the bigger or smaller value
 Given amount for one party & relationship, find amount for the other party
 Given two absolute amounts & one difference, find total amount
 Given final value and operations, find value
 Given target amount & an absolute amount, find required amount
 Given amount for one party & relationship, find total amount
 Given total quantity & differential quantity, find quantity of one item
 Given total amount & relationship, find amount for one party
 Given initial amount & final amount, find transactional amount
 Given total amount & relationship, find amount for one party
Fraction
 Find simplest form of a fraction
 Find the sum of two given fractions
 Find the difference between 1 whole and related fractions
 Given initial quantity and one event, find fraction of item left
 Given initial quantity and two events, find fraction of item left
 Given initial quantity, fraction of quantity remaining, find quantity in one event
 Given quantities of items, find fraction of one item within a group
Data Analysis
 Bar Graphs
Geometry
 Angels
 Perpendicular & Parallel Lines
Numbers
 Numbers up to 10,000
Measurement
 Area & Perimeter
 Length
 Mass
 Time
 Volume
Multiplication & Division
 Given total value and quantity for other notes, find the quantity for a particular note
 Given total quantity and number of sets, find the quantity for each set
 Given quantity of item in a set and number of sets, find quantity in a different set
 Given total quantity and quantity in a set, find remaining quantity
 Given total quantity, remaining quantity and quantity in each set, find number of sets
 Given relationship of quantities and quantity in each set, find quantity of one item
 Given unitary quantity and total quantity, find the number of sets
 Given total amount, amount remaining and number of sets, find amount in each set
 Given quantity of one set and relationship between sets, find quantity for another set
 Given amount for one character and amount relationship, find total amount
 Given total amount, and number in each set, find number of sets with remainder involved
Money
 Given amount for one character and amount relationship, find total amount
 Given total amount and cost of one item, find cost relationship
 Given final amount and events, find initial amount
 Given initial amount and unit amount for one event, find final amount
 Given cost of items and additional amount, find intial amount
 Given amount for one type of notes and change given, find cost
 Given unitary cost and cost condition, find total cost
 Given amount between different characters, find total amount
 Given relationships between different quantity of items, find cost of one single item
 Given total cost, cost of one item and number of items, find cost of the other item
Primary 4
 • Tables & Graphs • Decimals … • Fraction • Factors & Multiples … • Multiplication & Division • Area & Perimeter • Time • Angles …
Show All Topics for P4
Fraction
 Given a fraction, find number of unit fraction
 Express an improper fraction in mixed number
 Given final fractional amount & transfer fractional amount, find initial amount
 Given initial fractional amount & transfer fractional amount, find final amount
 Given fractional amounts, find total amount
 Given final fractional amount & transfer fractional amounts, find initial amount
 Given final fractional amount & transfer fractional amount, find initial amount. Involving improper fraction
 Given initial quantity & transfer amount, find final fraction
 Given total quantity & a fraction, find quantity of item
 Given a number & fractional relationship among different numbers, find total value
 Given fractional amount & absolute transfer amounts, find an absolute amount
 Given fractional quantity & absolute difference, find quantity of an item
 Given total quantity, quantity of a group & fractional quantity of subgroups, find absolute quantity of a subgroup
Multiplication & Division
 Given earning and spending per month and number of years of saving, find total savings
 Given total value, repeated quantity relationship, find value
 Given repeated quantity relationship & one absolute quantity, find total quantity
 Given total quantity & one absolute quantity, find quantity of an item
 Given unit price for different items, total sales & sales of one item, find the quantity sold
 Given total amount & repeated quantity relationship, find cost of item
 Given total amount & difference in unit price, find cost of item
 Given transaction amount & repeated quantity relationship, find initial amount
 Given repeated quantity relationship & total amount, find difference in unit price
 Given difference & repeated quantity relationship, find product of two numbers
Data Analysis
 Tables & Graphs
Decimals
 Decimals
Factors & Multiples
 Factors & Multiples
Geometry
 Angles
 Compass, Symmetry & Tessellation
Measurement
 Area & Perimeter
 Time
Numbers
 Numbers up to 100,000
Money
 Given quantity, amount paid and change amount, find unit price
 Given total quantity, total amount and unit price of one item, find unit price of the other item
 Given unit price and total amount, find quantity of one item
 Given unit price, total amount & difference in unit price, find quantity of one item
 Given two sets of itemcost relationship, find amount for a set of items
Primary 5
 • Average • Decimals & Measurement … • Fraction • Foursided Figures … • Area of Triangle • Percentage • Ratio • Whole Numbers …
Show All Topics for P5
Fraction
 Given total mass expressed in fraction
 Given fractional quantity & absolute quantities of items
 Given unit value & fractional relationship
 Given fractional savings amount & difference in total savings
 Given fractional quantity, absolute quantity of one group & subgroups relationship
 Given fractional quantity, absolute quantity, & repeatedquantity relationship
 Given total quantity of combinations involving a common item
 Given total amount, fractional & absolute relationship
 Given total amount & repeatedquantity relationship between a unit value and a fraction
 Given fraction and the increase in fraction & value
Ratio
 Given ratio & absolute amount of one party
 Given ratio & absolute quantity difference
 Given ratio & transfer amount
 Given ratio & total quantity at a later time frame
 Given ratio of items before and after addition & additional quantity
 Given two ratio sets among three parties
 Given two ratio sets among three partiees & amount for one party
 Given two sums & one ratio set among three parties
 Given ratio before and after a timeframe
 Given ratio before & total quantity after a timeframe
Data Analysis
 Average
Decimals
 Decimals & Measurement
Geometry
 Angles
 Foursided Figures
Measurement
 Area of Triangle
 Volume of Cubic Figures
Percentage
 Percentage
Whole Numbers
 Whole Numbers
Primary 6
 • Algebra • Pie Charts … • Fraction • Solid Figures & Nets … • Volume of Cubic Figures • Numbers Revision • Ratio • Speed …
Show All Topics for P6
Algebra
 Given relationship between two parties, find total amount
 Given amount of two transactions, find final amount
 Given quantityitem relationship & one absolute quantity, find total quantity
 Given absolute amount, quantity of items & a fractional relationship
 Given absolute amount, unit price and quantityprice relationship
 Given total quantity, unit quantity & one absolute quantity
 Given repeatedquantity relationship & absolute age
 Given repeatedquantity relationship & absolute relationship among parties
 Given total cost & quantitycost relationship, find unit cost
 Given average, fractional relationship & one absolute amount
Ratio
 Given ratio & one absolute amount, find transfer amount
 Given increase in quantity & ratio before and after quantity change, find initial quantity
 Given two ratio sets & one absolute amount
 Given price ratio before and after discount, find discounted price
 Given quantity ratio & total value of notes, find quantity of notes of a specific value
 Given fractional relationship & total age, find age ratio
 Given initial ratio, fractional spending & final amount difference, find amount for one party
 Given additional quantity & quantity ratio before and after, find final difference
 Given initial ratio, quantity added & repeated quantity after change, find quantity of an item
 Given two absolute amount & ratio between parties, find amount for one party
 Given fractional relationship & age ratio, find age of one party
 Given fractional relationship, find ratio
 Given ratio, fractional and absolute quantity of notes taken away & remaining value, find quantity of notes of a specific value
 Given initial ratio, saving amount & final ratio, find final amount
 Given two transfer events & corresponding ratio, find amount for one party
Fraction
 Involving division of a proper fraction by a proper fraction
 Involving division of a proper fraction by a proper fraction & get number of items
 Involving division of a whole number by a proper fraction
 Involving division of a proper fraction by a proper fraction & fraction multiplication
 Involving division of a proper fraction by a proper fraction & fraction subtraction
Data Analysis
 Pie Charts
Geometry
 Angles of Geometric Figures
 Solid Figures & Nets
Measurement
 Area & Circumference of Circles
 Volume of Cubic Figures
Numbers Revision
 Numbers Revision
Percentage
 Percentage
Speed
 Speed
What People Say about KooBits ProblemSums
“I like KooBits because it has helped in my mathematics i have now improved from 7080+ to 90++. I also like KooBits because it has competitions that we can take part in and compete to see how well we fair.”
Liau Ee Juin, CHIJ Our Lady of Good Counsel
“Dear KooBits, thanks for your timely help and bravo to your team in creating such a fabulous way of facilitating the children in learning maths. My son learnt so much in practicing koobits… His teacher was amazed at his enthusiasm in understanding maths concept. Really a lifesaver to all maths loving kids Thanks again.”
parent of Roshan. Aqtar, Yuhua Primary School
“My daughter has benefited tremendously from using KooBits on a daily basis and had fun with the challenge. We look forward to continuing to use KooBits to sharpen our girl’s math skills in a fun manner.”
parent of Noelle, Singapore Chinese Girl’s School
“I admit, I’m not really a fan of problem sums, however this portal has changed my mind about sums. I thought KooBits was just some random website. Boy was I wrong! :) This website has made me enjoy math. I enjoy my life here. Thanks a lot!”
Nathanael Fong, St. Hilda’s Primary School
“i will tell all my friends that koobits is very good in helping us in our probelmsums..ever since i used koobits,i improved so much in my problemsums”
Luqman Nulhakim Bin Toslimin, Xinmin Primary School
“KooBits is now a daily math ‘tuition’ for me. everyday, I wonder what the next day’s challenges will be. I look forward to doing it daily as points are accumulated.”
Ezra Lim Zheng Xi, Pei Hwa Presbyterian Primary School
“My classmates are going crazy about koobits. Those with iPads play koobits when the teacher is not in the classroom or when we are walking in school. They also play when we are queuing up for dismissal.”
Andrew Chua, Nan Hua Primary School
“KooBits has helped me a lot It improved my math to an A instead of a B. It is quite fun too!”
Cheryl Ong Zi Hui, East View Primary School
See Plans & Pricing
What You Get with KooBits ProblemSums

All topics aligned to the latest MOE maths syllabus

10,000+ problem sum questions for your child to practise

Detailed video lessons in each topic for selflearning

Stepbystep solutions with necessary models & diagrams
Currently KooBits ProblemSums is only available for school purchase.
Thank you for your interest! Sorry that usually we sell subscription to schools only. So you may check with your child’s school if the school will subscribe to KooBits ProblemSums for all students next year then you don’t need to buy it individually. If the school has no plans so far, you could recommend KooBits ProblemSums to the school.
However, for any parent who likes to purchase but the school decides not to subscribe soon, there are limited individual slots available, but it’s *by invitation only*, so you need a valid invitation from an existing member. Please follow the steps below:
Step 1: Write an email to [email protected] with the existing member’s full name and school, as well as your child’s full name and school;
Step 2: We’ll verify all information and send you a special payment link for you to purchase at a special rate;
Step 3: After successful online payment, we’ll send you login information in details.
Questions? Email: [email protected] OR Call: +65 6873 2370 / +65 8484 6624