Addition bridging tens
You learn to add and subtract across a ten by jumping to the ten first.
How to work it out
- Split the second number so you land on a multiple of ten.
- Jump to that ten first.
- Then add or subtract the rest.
76 + 8
- Split 8 into 4 and 4, because 76 + 4 = 80.
- Jump to 80.
- Then jump on with the rest: 80 + 4 = 84.
More examples
56 − 8
- Split 8 into 6 and 2, because 56 − 6 = 50.
- Jump back to 50.
- Then jump back with the rest: 50 − 2 = 48.
47 + 5
- Split 5 into 3 and 2, because 47 + 3 = 50.
- Jump to 50.
- Then jump on with the rest: 50 + 2 = 52.