Step-by-step Maths Level 3 · Subtracting within 1000 · Summary
Step-by-step Maths Level 3 Subtracting within 1000: summary and key words
Part of the Step-by-step Maths Level 3 subtracting within 1000 chapter. Chapter overview · whole chapter on one page
Chapter summary
| Skill | Method |
|---|---|
| Exchange from the ones | Break a ten into ten ones when the ones on top are too small |
| Exchange from the tens | Break a hundred into ten tens when the tens on top are too small |
| Subtract in columns | Line up the columns; subtract ones, tens, then hundreds |
| Check | Add the answer back to the number taken away |
| Missing number | Use the matching addition to find it |
Can you…?
- I can subtract a 1-digit number with exchange
- I can subtract 2-digit numbers with exchange
- I can subtract 3-digit numbers with exchange, using columns
- I can check a subtraction by adding the answer back
- I can find a missing number in a subtraction
Key terms
- exchange
- break one ten into ten ones, or one hundred into ten tens, to make a subtraction possible
- take away
- subtract, or remove a number from another
- inverse
- the operation that undoes another, such as addition undoing subtraction
- missing number
- the number we need to fill the gap in a calculation