Add the blocks column by column. When a column has ten or more, carry one to the box in the next column. Write each digit of the total.
| Hundreds | Tens | Ones | |
| 0 | 1 | ||
| 158+133 | |||
| =291 | 2 | 9 | 1 |
| Hundreds | Tens | Ones | |
| 205+174 | |||
| = |
| Hundreds | Tens | Ones | |
| 382+411 | |||
| = |
| Hundreds | Tens | Ones | |
| 416+560 | |||
| = |
| Hundreds | Tens | Ones | |
| 197+280 | |||
| = |
| Hundreds | Tens | Ones | |
| 319+113 | |||
| = |