
Common Denominators
Common denominator: when the numbers at the bottom of the fraction are the same
I was working with a family the other day, and she was saying that her son had been doing fractions for his homework and she’d had to look up what an integer was.
So, I hope this (very short) glossary helps:
Integer: whole number
Denominator: the number at the bottom of the fraction
Numerator: the number at the top of the fraction
Common denominator: when the numbers at the bottom of the fraction are the same.
If you have common denominators and you are asked to add the fraction, it becomes as simple as just adding the top numbers together, the bottom numbers stay the same.
It’s a bit like saying, I have a cake cut into 8 pieces (that’s the bottom number, the denominator).
You take 2 pieces and I take1 piece. The number of pieces we each take are the numerators. So, how many pieces did we take altogether? 2+1 =3
So, our answer will be 3/8 Three out of the 8 pieces have been taken.
It’s the same with subtracting. If we again have a cake that has been cut into 8 pieces, By the time I get to the table, you have again taken 2 pieces, so we have 6/8 pieces left.
When the cake was whole, we had 8 pieces, you took 2, this left us with 6 out of the 8 pieces, which as a fraction would be written as 6/8.
I then come along and take1 piece. (The number of pieces we each take are the numerators).
So, how many pieces that are left now is 6/8 – 1/8 = 5/8.
I hope that makes sense and I’m not just waffling...

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