Please answer the following essay question:
2 answers:
Answer: The denominator of a fraction tells you the relative size of the pieces. Therefore, the reason fractions need a common denominator before adding or subtracting is so that the numbers of pieces you are adding/subtracting are all the same size.
Answer:
We need to have a common denominator in order to subtract different fractions because if we have an example like.
5/2 - 6/8 we cannot do that because the denominator is not alike.
We have to use multiplication to help us here.
2 x 8 = 16 !
So. no we have 5/16
so now we do 5 x 8 = 40
So now my new fraction is - 40/16 BUTTTT 40/16 is an improper fraction. so 40/16 = 5/2
Now we are back at the square 1 so now we have to fix 6/8.
8 x 6 = 48
6 x 6 = 36.
--
2 x 24 = 48.
5 x 24 = 120 or 12
now we have 12/48 and 36/48.
We can subtract now!
Hope this helped for problems like this.
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