Step-by-step Maths Level 3 · Adding within 1000 · Summary
Step-by-step Maths Level 3 Adding within 1000: summary and key words
Part of the Step-by-step Maths Level 3 adding within 1000 chapter. Chapter overview · whole chapter on one page
Chapter summary
| Skill | Method |
|---|---|
| Add a 1-digit number | Add the ones; if they make 10 or more, carry a ten |
| Add two 2-digit numbers | Add the ones, then the tens; carry when needed |
| Add 3-digit numbers | Line up the columns; add ones, tens, hundreds; carry as you go |
| Check an answer | Estimate first by rounding; check the answer is close |
Can you…?
- I can add a 1-digit number to a 2-digit or 3-digit number, with carrying
- I can add two 2-digit numbers, carrying from the ones or the tens
- I can add two 3-digit numbers, carrying from the tens to the hundreds
- I can set out a sum in columns, with the digits lined up
- I can estimate an answer and check my answer is close
Key terms
- carry
- move a ten to the next column when a column makes 10 or more
- column method
- writing numbers in columns so the digits line up
- estimate
- a sensible guess that is close to the exact answer
- altogether
- a word that often means add