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Addition and Subtraction (Year 5)
You add 0.6 to 6.4 to make 7.

Addition and Subtraction (Year 5)

In Year 5, which is like the third year of KS2 Maths, we'll tackle some more challenging addition and subtraction puzzles, even with tricky decimals! By now, we know how to use plus (+) for adding and minus (-) for taking away. Plus (+) helps make numbers bigger, like 5 + 5 = 10. Minus (-) makes numbers smaller, like 8 - 4 = 4. We have cool tricks like counting steps, rounding numbers, and using number bonds to make Maths easier!

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1.
Which of these pairs would not total 700?
673 + 37
654 + 46
687 + 13
648 + 52
673 + 37 = 710
2.
Which is the best method of calculating the missing number in this problem: ___ - 23 = 176?
176 - 23
176 + 23
23 - 176
123 - 76
176 + 23 = 199
so 199 - 23 = 176
3.
Which number sentence is incorrect?
875 - 56 = 819
819 + 56 = 875
56 + 819 = 875
819 - 56 = 875
The correct number sentence would be 875 - 819 = 56
4.
Which strategy would be best to calculate 347 + 97?
Add 100 to 347 subtract 3
Add 100 to 347 add 3
Subtract 100 from 347 add 3
Subtract 100 from 347 subtract 3
347 + 100 = 447
447 - 3 = 444
so 347 + 97 = 444
5.
Which of these pairs does not total 1?
0.2 + 0.8
0.4 + 0.6
0.7 + 0.3
0.1 + 0.8
1 + 8 = 9
so 0.1 + 0.8 = 0.9
6.
What would you add to 6.4 to make 7?
0.4
0.6
0.7
1.6
The best way to work this out is to take 6.4 from 7, which would give you the answer 0.6
7.
Which is the best method of calculating 1.5 + 1.6?
Double 1.5 add 0.1
Double 1.5 add 1
Double 1.5 subtract 1
Double 1.5 subtract 0.1
1.5 x 2 = 3.0
3.0 + 0.1 = 3.1
so 1.5 + 1.6 = 3.1
8.
What is the best method of subtracting 79?
Add 80 subtract 1
Add 80 add 1
Subtract 80 subtract 1
Subtract 80 add 1
e.g. 456 - 79 so 456 - 80 = 376 + 1 = 377
9.
Which of these pairs does not total 100?
28 + 72
39 + 61
17 + 83
57 + 53
57 + 53 = 110
10.
How would you calculate 3,004 - 2,898?
Double 3,000 then adjust
Count in 1s from 2,898 to 3,004
Count up in 3 steps from 2,898 to 3,004
Count up in 5 steps from 2,898 to 3,004
e.g. 2,898 + 2 = 2,900 + 100 = 3,000 + 4 = 3,004 so 3 steps gives the answer 106
You can find more about this topic by visiting BBC Bitesize - Adding and subtracting

Author:  Amanda Swift

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