00:01
4 plus 3 over 2 plus 5 is not equal to 4 halves plus 3 fits.
00:06
Simple explanation is because whenever we have an expression divided by another expression, there are invisible or implied parentheses around each expression.
00:17
They may not be written, but the division sign acts as parentheses between these two.
00:24
So when we have 4 plus 3 and 2 plus 5 in parentheses, we have to solve what's in the parentheses first.
00:31
So we get 4 plus 3 is 7, and 2 plus 5 is 7, and that gives us 1.
00:38
If we solved here, we'd have to get a common denominator.
00:45
Our common denominator with 2 and 5 would be our lowest common multiple, which is 10, because we have 2.
00:52
Here are some of our multiples, and here are some multiples of 5, and there you go.
01:00
This is our least common multiple.
01:02
So we're going to multiply our four halves by five over five to give it a denominator of ten...