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Adding several numbers
Example:
| 4 | 7 | 8 | 9 | 6 |
| 8 | 3 | 9 | 2 | 4 |
| | 1 | 7 | 8 | 5 |
| 4 | 6 | 7 | 5 | 1 |
| | | 9 | 2 | 8 |
| | | | 5 | 4 |
| | 9 | 2 | 4 | 7 |
| 2 | 1 | 4 | 2 | 5 |
- | - | - | - | - | - |
2 | 3 | 5 | 4 | 4 | - |
2 | 1 | 2 | 0 | 1 | 0 |
We add the first column from the right, then the next etc. and then add them together:
6+4+5+1+8+4+7+5=40
9+2+8+5+2+5+4+2=37
8+9+7+7+9+2+4=46
7+3+1+6+9+1=27
4+8+4+2=18
Now we can write them under the columns like above and do all the carry overs or we add those sums together:
| | | | 4 | 0 |
| | | 3 | 7 | |
| | 4 | 6 | | |
| 2 | 7 | | | |
1 | 8 | | | | |
- | - | - | - | - | - |
1 | 1 | 1 | 1 | | |
2 | 1 | 2 | 0 | 1 | 0 |
It's good practise to do both to see if one has made a mistake.
To add several numbers like 6+4+5+1+8+4+7+5=40
you look for numbers that make 10 together like 6+4 and 5+5 in this example, then you only need to add 1+8+4+7, this makes the calculations a bit easier.
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