 You add 0.6 to 6.4 to make 7.

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Addition problems use the plus sign + (for adding) and subtraction problems use the minus sign - (for taking away) when they are written down. The plus sign denotes that one or more numbers should be added to others to get a larger amount, for example 5 + 5 = 10. The minus sign means that one or more numbers should be taken away, for example 8 - 4 = 4. There are several techniques that we can use to simplify math problems and make them easier, such as counting in steps, rounding numbers up or down, or using number bonds.

1.
What is the best method of subtracting 79?
Subtract 80 subtract 1
e.g. 456 - 79 so 456 - 80 = 376 + 1 = 377
2.
Which of these pairs does not total 100?
28 + 72
39 + 61
17 + 83
57 + 53
57 + 53 = 110
3.
Which is the best method of calculating 1.5 + 1.6?
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
4.
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
5.
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
6.
How would you calculate 3,004 - 2,898?
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
7.
Which of these pairs would not total 700?
673 + 37
654 + 46
687 + 13
648 + 52
673 + 37 = 710
8.
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
9.
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
10.
Which strategy would be best to calculate 347 + 97?
Add 100 to 347 subtract 3