← Methods
Left-to-Right Subtraction
Take the tens off first, then the ones. Nothing goes below zero on the way, so there is no borrowing to keep track of.
When it works
Taking away a number too far from a round one to be worth rounding.
Worked through
486 − 53 = 433
- 486 − 50 = 436Take 50 off first.
- 436 − 3 = 433Then take off 3.
10 problems, every one of them this method.