To work out an answer, often by adding or subtracting.

Not wasting time or effort. An efficient strategy is one we can carry out easily.

Use efficient addition strategies to calculate

Maths

Combine tens and ones within equations

Add two-digit numbers without crossing the tens boundary

Find the missing addend when adding two-digit numbers

Add 2-digit numbers when crossing the tens boundary

Solve problems involving the addition of two-digit numbers

Explain different strategies used to subtract

Solve equations involving the subtraction of two-digit numbers

Solve problems involving subtraction of two-digit numbers

Subtract two-digit numbers crossing the tens boundary

Find the missing part when subtracting two-digit numbers

Solve problems involving subtraction when bridging 10

Use efficient methods to solve subtraction equations

Solve problems involving addition and subtraction

Create addition and subtraction problems

In this unit pupils apply their knowledge of known facts and understanding of place value to add and subtract with 2-digit numbers both within and across the tens boundary. In the future unit pupils will add 3 addends, understanding they can be added in any order, bridging through 10.

In the prior unit pupils added and subtracted 1s and 10s from 2 digit numbers. They used number facts to add/subtract a single-digit number to/from a 2-digit number and used a part-part-whole model to represent addition and subtraction. In this unit pupils apply knowledge of known facts and understanding of place value to add and subtract with 2-digit numbers within and across the tens boundary.

In this unit pupils apply their knowledge of known facts and understanding of place value to add and subtract with 2-digit numbers both within and across the tens boundary.

Addition and subtraction of two 2-digit numbers

Any of the numbers that are added together.

To split a whole up into parts; a piece or section of a whole.

To split a whole up into parts - a piece or section of a whole.

An addition or subtraction strategy where numbers are partitioned to reach the previous or next multiple of 10, so bonds to 10 can be used to calculate more efficiently.

Numbers which follow each other in order, without gaps.

The result of subtracting one number from another.

Addition involves finding the total, or sum, by combining two or more numbers.

Subtraction involves taking one number away from another.

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Addition and subtraction of two 2-digit numbers

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