00:01
So with this problem, we are going to explain why we line up the decimal points and corresponding place value columns when adding decimals.
00:06
So i wrote out a little example for you of 10 .6 plus 5 .7, but we did not, i didn't line up the decimal points intentionally.
00:16
This completely looks wrong, right? because when you have 5 .7, if we stripped away the decimal places and the decimals afterwards, we would be left with this.
00:29
And then it would just be 10 plus 5.
00:32
And when we add 10 plus 5 together, we don't add the 1 and the 5 together first.
00:37
We add the 0 in the 5 because those are both in the 1's place.
00:41
And the same goes for when we're using decimals.
00:44
So let me write this in proper form, 10 .6 plus 5 .7...