Addition and Subtraction 1
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.

1.
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
2.
Which is the missing number: 7 + __ = 20?
10
12
13
14
One way to work this out is to take 7 away from 20 which will give you the answer 13
3.
75 subtract 40.
30
35
40
45
7 - 4 = 3 so 70 - 40 = 30
30 + 5 = 35
4.
What is the sum of 14 and 8?
18
20
21
22
14 + 10 = 24
24 - 2 = 22
5.
17 take away 8.
9
10
11
12
17 - 10 = 7
7 + 2 = 9
6.
What is 78 + 56?
134
138
124
128
It might help to add the tens first and then the units
7.
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
8.
Which will not total 100?
65 + 35
55 + 45
75 + 35
85 + 15
75 + 35 = 110
9.
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
10.
Add 8, 9 and 4.
17
20
21
25
A good strategy would be 8 + 10 - 1 = 17
17 + 3 = 20 plus 1 left over = 21
Author:  Amanda Swift

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