Adding and taking away within 18 · Usually met around P1
Making ten
Make 10 first, then add what's left.
How to do it
Method
Make 10 first, then add what's left
8 + 5 = 8 + 2 + 3 = 10 + 3 = 13
Full working
Split 5 into 2 and 3: 8 + 2 = 10, 10 + 3 = 13
In full
Fill the bigger number up to ten by splitting the smaller one. 8 + 5 → 8 needs 2 to make ten, so split the 5 into 2 and 3. Then 8+2=10, and 10+3=13. Make the ten first, then add what's left.
Worked examples
Have a go first, then open each one for the answer and the working.
Example 1
9 + 4
Show the answer and working
Answer: 9 + 4 = 13
9 is 1 short of ten, so split 4 into 1 and 3: 9 + 1 = 10, 10 + 3 = 13
Example 2
5 + 8
Show the answer and working
Answer: 5 + 8 = 13
8 is 2 short of ten, so split 5 into 2 and 3: 8 + 2 = 10, 10 + 3 = 13
Example 3
9 + 5
Show the answer and working
Answer: 9 + 5 = 14
9 is 1 short of ten, so split 5 into 1 and 4: 9 + 1 = 10, 10 + 4 = 14
Practise it in the game →Adding and taking away within 18 · Free to start, unlimited questions, no download