Column addition
You learn to add big numbers by writing them in columns and adding one column at a time.
How to work it out
- Line up in columns: ones under ones.
- Start on the right.
- If a column sum is 10 or more, write the ones and carry 1 ten to the next column.
11
347
+265
612
347 + 265
- Ones: 7 + 5 = 12, write 2 and carry 1.
- Tens: 4 + 6 + 1 = 11, write 1 and carry 1.
- Hundreds: 3 + 2 + 1 = 6.
- The answer is 612.
More examples
486 + 379
- Ones: 6 + 9 = 15, write 5 and carry 1.
- Tens: 8 + 7 + 1 = 16, write 6 and carry 1.
- Hundreds: 4 + 3 + 1 = 8.
- The answer is 865.
11
486
+379
865
654 + 178
- Ones: 4 + 8 = 12, write 2 and carry 1.
- Tens: 5 + 7 + 1 = 13, write 3 and carry 1.
- Hundreds: 6 + 1 + 1 = 8.
- The answer is 832.
11
654
+178
832