Addition bridging ten
You learn additions that cross ten by filling up to exactly ten first.
How to work it out
- Split the second number to land on ten.
- Add to ten first.
- Then add the rest.
7 + 8
- Split 8 into 3 and 5, because 7 + 3 = 10.
- Add the 3 first: 10.
- Then add the 5: 10 + 5 = 15.
More examples
9 + 4
- Split 4 into 1 and 3, because 9 + 1 = 10.
- Add the 1 first: 10.
- Then add the 3: 10 + 3 = 13.
6 + 7
- Split 7 into 4 and 3, because 6 + 4 = 10.
- Add the 4 first: 10.
- Then add the 3: 10 + 3 = 13.
8 + 5
- Split 5 into 2 and 3, because 8 + 2 = 10.
- Add the 2 first: 10.
- Then add the 3: 10 + 3 = 13.