Step-by-step Maths Level 5 · Long multiplication of two-digit by one-digit numbers · Summary
Step-by-step Maths Level 5 Long multiplication of two-digit by one-digit numbers: summary and key words
Part of the Step-by-step Maths Level 5 long multiplication of two-digit by one-digit numbers chapter. Chapter overview · whole chapter on one page
Chapter summary
| Skill | Method |
|---|---|
| Two-digit by one-digit | Multiply the ones, then the tens; write each in its column |
| Carrying | Write the ones digit; carry the tens; add the carry to the next product |
| Three-digit by one-digit | Work from the right; carry from each column into the next |
| Estimating and checking | Round to an easy number; check by dividing |
| Word problems | Equal groups and scaling are multiplication; keep the unit |
Can you…?
- I can multiply a two-digit number by a one-digit number, column by column
- I can carry tens into the next column when multiplying
- I can multiply a three-digit number by a one-digit number
- I can estimate a product by rounding, and check it by division
- I can solve multiplication word problems with equal groups and scaling
Key terms
- product
- the answer to a multiplication
- carry
- move the tens from one column to the column on its left
- estimate
- a sensible guess, found by rounding first
- scaling
- making an amount a number of times as big