How do you find the sum of a two digit addends?

Answer 1

It involves lots of carrying :) Ok, here's how: Imagine you have the problem 20+10. You might automatically know that the answer is 30, but I'll show you how. Line the problem up vertically (you may not want to do this at first, but trust me, it's a lot easier):

20

+ 10

____

Now, the first thing you'd do would be to add the top number to the bottom number in the ONES COLUMN ONLY. Always, always, always, start from the right. So, what you have is: 0+0. Which equals 0. So now, your problem looks like this:

20

+ 10

____

0

The next thing you would do would be to do the same thing in the tens column. And 2+1 = 3.

20

+ 10

____

30

That's the simple version. Now, what if you have a problem that looks like this: 35+26. So let's set it up vertically again.

35

+ 26

____

When you have a number on top that's bigger than the one in the same column on the bottom, you do something called carrying. It looks like this:

(1)35

+ 26

____

We know that 5+6=11, right? So we put the 1 in the ones column under the bar.

35

+ 26

_____

1

Now what do you do with your other 1? The other 1 goes on top of the 3 in 35, and you add it like 1+3, which equals four. And we have:

45

+ 26

_____

1

Remember, you've already added the 5 and 6, so disregard them for now.

4

+2

___

1

4+2 = 6. So, place the 6 in the tens column, and here's your answer:

35

+ 26

____

61

Hope this helps!