Addition 100
About this exercise
Adding two numbers, with the answer chosen from a set of options.
Example problems
A few of the problems this exercise asks. The printable worksheet holds ten fresh ones.
- 17 + 81 =
- 61 + 10 =
- 48 + 46 =
- 28 + 27 =
Try it yourself first — open a section below only if you get stuck.
How to solve it
Add the ones first, then the tens. When the ones pass ten, carry the extra ten across before finishing.
Worked example
For 43 + 24, add the ones (3 + 4 = 7) then the tens (40 + 20 = 60), which gives 67.
Common mistake
Forgetting to carry. In 28 + 7 the ones make 15, so the ten inside it has to move up: the answer is 35, not 25.