Subtract multiples of ten from 2-digit numbers

I can use number facts to subtract multiples of ten from a two-digit number.

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Year 2

Subtract multiples of ten from 2-digit numbers

I can use number facts to subtract multiples of ten from a two-digit number.

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Share activities with pupils

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Lesson details

Key learning points

When subtracting multiples of ten from a two-digit number, the tens digit changes but the ones digit stays the same.
We can use number facts to help us subtract multiples of ten from a two-digit number.

Keywords

Multiples of ten - The numbers that are said when we count on in tens from zero. Multiples of ten always have a ones digit of zero.
Recombine - To add the parts of a number gained through partitioning the whole to reach the whole again.

Common misconception

Children may automatically count back in tens to subtract a multiple of ten.

Discuss efficiency and compare different methods. Use practical equipment to draw attention to the relationship between adding multiples of ten in two-digit numbers and the known facts they already possess.

When recording the steps followed when subtracting, avoiding equations such as 56 - 20 = 50 + 6 - 20 = 30 + 6 = 36. At this stage, using both addition and subtraction signs when adding will not be familiar to the children and could confuse and distract from the focus of the equation.