Operations for Singapore primary maths
Explore what joining, taking away, equal groups and fair sharing mean. Number bonds, arrays and bar models connect these ideas to addition, subtraction, multiplication and division.
Choose your primary level and path. Each guide links to the interactive lesson and its prerequisite ideas.
Primary 1 operations
- Find the missing partFind a missing part when the whole and one part are known · About 10 minutes
- Missing numbers in take-awayFind the starting number when the parts are known · About 10 minutes
- Add by combining two setsAdd by combining two sets · About 8 minutes
- Subtract by taking awaySubtract by taking away · About 8 minutes
- Connect addition and subtraction with number bondsConnect addition and subtraction with number bonds · About 8 minutes
- Use +, − and = correctlyUse +, − and = correctly · About 8 minutes
- Add and subtract within 100Add and subtract within 100 · About 8 minutes
- Add three one-digit numbersAdd three one-digit numbers · About 8 minutes
- Add four small numbers · extra practiceExtend three-number addition by joining one more small group, with totals within 20 · About 10 minutes
- Recall addition and subtraction facts within 20Recall addition and subtraction facts within 20 · About 8 minutes
- Add or subtract ones and tens mentally without regroupingAdd or subtract ones and tens mentally without regrouping · About 8 minutes
- Recognise equal groups and multiplication within 40Recognise equal groups and multiplication within 40 · About 8 minutes
- Share or group equally within 20Share or group equally within 20 · About 8 minutes
Primary 2 operations
- Equal groups become multiplicationRecognise equal groups and describe them as groups of · About 12 minutes
- Two kinds of divisionShare a quantity equally and say how many each · About 12 minutes
- Add and subtract numbers up to three digitsAdd and subtract numbers up to three digits · About 8 minutes
- Mentally add or subtract ones, tens and hundreds from three-digit numbersMentally add or subtract ones, tens and hundreds from three-digit numbers · About 8 minutes
- Use the 2, 3, 4, 5 and 10 multiplication tablesUse the 2, 3, 4, 5 and 10 multiplication tables · About 8 minutes
- Connect multiplication with divisionConnect multiplication with division · About 8 minutes
- Use the division symbolUse the division symbol · About 8 minutes
- Recall related multiplication and division factsRecall related multiplication and division facts · About 8 minutes
Primary 3 operations
- Add and subtract up to four-digit numbersAdd and subtract up to four-digit numbers · About 10 minutes
- Mentally add and subtract two-digit numbersMentally add and subtract two-digit numbers · About 10 minutes
- Recall the 6, 7, 8 and 9 multiplication tablesRecall the 6, 7, 8 and 9 multiplication tables · About 10 minutes
- Interpret remaindersInterpret remainders · About 10 minutes
- Multiply up to three digits by one digitMultiply up to three digits by one digit · About 10 minutes
- Divide up to three digits by one digitDivide up to three digits by one digit · About 10 minutes
Primary 4 operations
- Multiply up to four digits by one digitMultiply up to four digits by one digit · About 10 minutes
- Multiply up to three digits by two digitsMultiply up to three digits by two digits · About 10 minutes
- Divide up to four digits by one digitDivide up to four digits by one digit · About 10 minutes
Primary 5 Foundation operations
- Add and subtract up to three-digit numbers without a calculatorAdd and subtract up to three-digit numbers without a calculator · About 12 minutes
- Mentally add and subtract ones, tens and hundredsMentally add and subtract ones, tens and hundreds · About 12 minutes
- Multiply and divide up to two digits by one digit without a calculatorMultiply and divide up to two digits by one digit without a calculator · About 12 minutes
- Multiply and divide by 10, 100 and 1000 and their multiples without a calculatorMultiply and divide by 10, 100 and 1000 and their multiples without a calculator · About 12 minutes
- Use the order of operations and bracketsUse the order of operations and brackets · About 12 minutes
- Recall multiplication and division factsRecall multiplication and division facts · About 12 minutes