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

Add and subtract 10 to and from a 2-digit number.

Maths

In this unit pupils will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction. In the future unit pupils will learn to find 10 more or less than a 2-digit number They will  add and subtract 10 to/from a 2-digit number using number facts

In the prior unit pupils added 3 addends. They used strategies such as finding 2 addends to total 10 or 2 numbers to bridge though 10. In this unit pupils will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction.

Adding and subtracting ones and tens to and from 2-digit numbers

Adding 10 is the same as finding 10 more. Match the equations to their sums.

Subtracting 10 is the same as finding 10 less. Match the equations to their difference.

Match two numbers that have a difference of 10

True or false. The numbers in this sequence are increasing by 10 each time.

Match so that the second number is 10 more than the first.

Match so that the second number is 10 less than the first.

Look at the number in the place value chart. 10 less than this number is {{ }}

This lesson will soon be taken down.

Add and subtract 10 to and from a 2-digit number.

Lesson outcome