Solve problems by adding and subtracting tens and ones

I can solve problems that require the addition and subtraction of tens and ones.

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Year 2

Solve problems by adding and subtracting tens and ones

I can solve problems that require the addition and subtraction of tens and ones.

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Share activities with pupils

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Lesson details

Key learning points

When tens and ones are combined to make a two-digit number, it can be represented as an addition equation.
When a two-digit number is partitioned into tens and ones, it can be represented as a subtraction equation.
We can use bar models to help us understand and represent a problem.

Keywords

Addition - Finding the total, or sum, by combining two or more numbers.
Subtraction - Taking one number away from another.
Part - A piece or section of a whole
Whole - All of something; complete.

Common misconception

Children may confuse addition and subtraction on bar models and in problems, so may add instead of subtracting or subtract instead of adding.

Cuisenaire rods or strips of paper with numbers written upon them can be manipulated as bar models that represent a problem or equation. This way, the structure of the mathematics can be discussed.

As the focus of this lesson is on the structure of the mathematics within problems and how this is represented as a bar model, children should be confident with the addition and subtraction of tens and ones before attempting to solve problems, so they are not distracted by the calculations involved.

Teacher tip

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).