Use number facts to add or subtract a one-digit number and a two-digit number.

I can add and subtract a single digit number and a two-digit number.

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Year 2

Use number facts to add or subtract a one-digit number and a two-digit number.

I can add and subtract a single digit number and a two-digit number.

Download all resources

Share activities with pupils

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Lesson details

Key learning points

Known facts can be used to help solve equations with larger numbers.
Partitioning a two-digit number into tens and ones can help with seeing the pattern in the ones.
When adding to or subtracting from the ones without crossing the tens boundary, the tens digit does not change.

Keywords

Equation - An equation has an equal sign. It shows that what is on the left of the equation is equal to what is on the right.

Common misconception

Children may not recognise known facts when addends are presented in different order, e.g. they may not use 7+1 to solve 61 +7 They may also confuse tens and ones digits.

Focus on efficient ways of working and, when working in the abstract, partition the two-digit number into tens and ones, so the tens and ones digits can be easily identified and the commutative aspect of the ones digit can be more easily seen.

Do not include additions which sum to a multiple of ten or subtractions from a multiple of ten as these will be covered separately. When giving problems, also give the solution rather than asking children to solve, so that they maintain focus on the structure of the problem.