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Year 2

We can add and subtract two-digit numbers using practical equipment.We can add and subtract in our head.

What we are learning:

• Addition can be done in any order. The order chosen should reflect the numbers in the addition:
7 + 20 + 3 = add the 7 and 3 first to make 10, then add to the 20
Always look for the simplest order to add the numbers together.
• Subtraction cannot be done in any order. The method used for mental subtraction should be chosen to reflect the numbers in the subtraction:
20 – 7 = start on 20 and count back 7 (we are not taking many away)
26 – 21 = start on 21 and count on until we get to 26 (your child should be able to see that the difference between the numbers is small). You can use a number line to show this.

Activities you can do at home:

Activity 1 Addition and subtraction games
Make two sets of number cards of two-digit numbers including the multiples of ten, and one digit numbers and some operation cards addition and subtraction( -, +). Shuffle the cards and place face down in three different piles (two-digit numbers, one-digit numbers and the operation cards).

Take a card from each pile. For example 7 + 20. Add these together mentally, or using resources or on a number line. Don’t forget to re-order the numbers – so for the question above the child should put the larger number first and add on the smaller number.
Remember if you use objects to help you just need to count out the 7 and count on from 20.

What is 20 + 8?
What is 5 + 20+5? How did you work it out? Are there any other ways of working this out? Which is the easiest way for you?