Adding and taking away within 18 · Usually met around P1
Adding within 10
Add 1–3: count on. More: use pairs to 10.
How to do it
Method
Add 1–3: count on. More: use pairs to 10
5 + 4: 5 and 5 make 10; 4 is 1 less → 10 − 1 = 9
Another way
Counting on
3 + 6: from 6, count on 7, 8, 9
In full
To add 1, 2 or 3, count on from the bigger number: 3 + 6 → 7, 8, 9. To add more, use the pairs that make ten and split. 5 + 4 → 5 and 5 make ten. Split that 5 into 4 and 1, so 5 + 4 is one less than 10: 9. Adding 0 changes nothing.
Worked examples
Have a go first, then open each one for the answer and the working.
Example 1
5 + 5
Show the answer and working
Answer: 5 + 5 = 10
5 and 5 make ten, 5 + 5 = 10
Example 2
2 + 5
Show the answer and working
Answer: 2 + 5 = 7
Count on 2 from the bigger number 5: 6, 7, 5 + 2 = 7
Example 3
2 + 3
Show the answer and working
Answer: 2 + 3 = 5
Count on 2 from the bigger number 3: 4, 5, 3 + 2 = 5
Practise it in the game →Adding and taking away within 18 · Free to start, unlimited questions, no download