adding several numbers

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.