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When you're adding integers using the column method, it's important to remember 3 things:
1) Line up the numbers using place value (units with units, tens with tens, etc.)
2) Start adding from the right.
3) Don't forget to carry.
e.g. 185 + 71
Step 1: Set up the addition accurately.
| 185 |
| + 71 |
Step 2: Start by adding the units. (5 + 1 = 6)
| 185 |
| + 71 |
| 6 |
Step 3: Now add the tens column. (8 + 7 = 15)
As this isn't a single digit number, we have to carry the 1 into the next column like this:
| 185 |
| + 71 |
| 1 |
| 56 |
Step 4: Finally, add the hundreds column. Don't forget the 1 we carried! (1 + 1 = 2)
| 185 |
| + 71 |
| 1 |
| 256 |
Answer: 185 + 71 = 256
Before you start this activity, make sure you have a pen and paper handy to write out your columns and sums.
