Step-by-step Maths Level 2 · Adding and subtracting within 100 · Summary
Step-by-step Maths Level 2 Adding and subtracting within 100: summary and key words
Part of the Step-by-step Maths Level 2 adding and subtracting within 100 chapter. Chapter overview · whole chapter on one page
Chapter summary
| Skill | Method |
|---|---|
| Add a 1-digit number | Add to the ones; keep the tens |
| Add a multiple of 10 | Add the tens; keep the ones |
| Add two 2-digit numbers | Add the tens, add the ones, put together |
| Subtract two 2-digit numbers | Take the tens away, take the ones away, put together |
| Columns | Tens under tens, ones under ones; ones first |
Can you…?
- I can add a 1-digit number to a 2-digit number
- I can add a multiple of 10 to a 2-digit number
- I can add two 2-digit numbers by adding tens and ones
- I can subtract two 2-digit numbers by subtracting tens and ones
- I can set out a sum in columns
Key terms
- sum
- an addition, for example 23 + 45
- difference
- the answer to a subtraction, for example 68 - 23 = 45
- column
- a line of digits in the same place value, for example all the tens together
- no carrying
- the ones add to 9 or less, so the tens do not change