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A good strategy for adding 9 is to add 10 and take away 1.

Addition and Subtraction 1

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Addition is when you add two or more numbers together and subtraction is when you take them away. If you are having a party and know that 10 girls and 7 boys will be attending, how many prizes are you going to need? Well, 10 plus 7 is 17. You've got 20 prizes so how many will you have spare? Well, 20 minus 17 is 3. You've just worked out two problems - one addition and one subtraction. Knowing how to solve these problems is very useful in real life.

Add 8, 9 and 4.

A good strategy would be 8 + 10 - 1 = 17
17 + 3 = 20 plus 1 left over = 21

75 subtract 40.

7 - 4 = 3 so 70 - 40 = 30
30 + 5 = 35

17 take away 8.

17 - 10 = 7
7 + 2 = 9

What is the sum of 14 and 8?

14 + 10 = 24
24 - 2 = 22

Which is the missing number: 7 + __ = 20?

One way to work this out is to take 7 away from 20 which will give you the answer 13

What is 78 + 56?

134

138

124

128

It might help to add the tens first and then the units

Which is a good strategy for adding 9?

Add 20 and take away 11

Add 10 and take away 1

Take away 10 add 1

Take away 20 add 11

e.g. 35 + 9 so 35 + 10 = 45 then 45 - 1 = 44

Which will not total 100?

65 + 35

55 + 45

75 + 35

85 + 15

75 + 35 = 110

Which is the best method of calculating 45 + 46?

Double 45 add 1

Add the tens first and then the units

Count on from 45

Add the units first and then the tens

45 x 2 = 90
90 + 1 = 91

10.

Which number sentence is incorrect?

8 + 5 = 13

13 - 5 = 8

5 + 8 = 13

8 - 5 = 13

The other number sentence that would be correct is 13 - 8 = 5

Author: Amanda Swift

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