How it works
Every jump is the same size: 1, 10 or 100.
Watch the digit that changes: it is the place you're jumping in.
Counting on by 10 changes the tens digit. By 100, the hundreds.
Worked examples
Add a hundred
- 807 + 100 = ?
- Add one to the hundreds digit.
- The tens and ones stay the same.
- So the answer is 907.
Count in ones
- 797, counting on in ones: ?, ?, ?, ?
- Say each number in order.
- After 799 comes 800.
- So the answer is 798, 799, 800, 801.
Add a ten
- 597 + 10 = ?
- Add one to the tens digit.
- If the tens reach ten, the hundreds go up.
- So the answer is 607.
A taste of the worksheet
These are the first problems of set A. The printable sheet has many more, with an answer key.
- 75, counting on in fives: __, __, __, __
- 369, counting on in ones: __, __, __, __
- 660 + 10 = __
- 969, counting on in ones: __, __, __, __
- 200, counting on in tens: __, __, __, __