Write the numbers one above the other so the ones, tens and hundreds line up. Start adding with the ones column on the right.
If a column adds up to 10 or more, write the ones digit and carry the ten to the next column. For 368 + 254: 8 + 4 = 12, write 2 and carry 1. Then 6 + 5 + 1 = 12, write 2 and carry 1. Then 3 + 2 + 1 = 6. The answer is 622.
Worked example
Work out 475 + 318
- Ones: 5 + 8 = 13. Write 3, carry 1.
- Tens: 7 + 1 + 1 = 9. Hundreds: 4 + 3 = 7.
Answer:793
Key words
- column
- a line of digits with the same place value
- carry
- move a ten to the next column
- line up
- put digits of the same place under each other
Practise this
New questions every time.
Common Core-referenced: 2.NBT.B.7