Adding and taking away within 18 · Usually met around P1
Number bonds to 10
Know each pair that makes 10 on sight.
How to do it
Method
Know each pair that makes 10 on sight
3 + 7 = 10, 4 + 6 = 10
Another way
Number bonds
10 splits into 3 and 7
In full
These pairs make ten: 1+9, 2+8, 3+7, 4+6, 5+5, and 0+10. When you see one number, its partner should pop into your head straight away, with no counting. Every carry, borrow and bridge later on is built on these.
Worked examples
Have a go first, then open each one for the answer and the working.
Example 1
8 + ? = 10
Show the answer and working
Answer: 8 + 2 = 10
8 and 2 make ten, 8 + 2 = 10
Example 2
9 + ? = 10
Show the answer and working
Answer: 9 + 1 = 10
9 and 1 make ten, 9 + 1 = 10
Example 3
5 + ? = 10
Show the answer and working
Answer: 5 + 5 = 10
5 and 5 make ten, 5 + 5 = 10
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