Before you can add or subtract, both fractions must have the same denominator, and
making that change without changing the value of either fraction is your job. The best
choice for a 'common' denominator is usually the least common multiple of the original
denominators.
no, to add and subtract like and unlike fractions the denominator has to be the same,
first find a common denominator then subtract the top numbers
When you want to add or subtract unlike fractions.
Convert unlike fractions to equivalent fractions with common denominators by finding the LCM of the denominators.
Make the fractions equivalent then subtract
no, to add and subtract like and unlike fractions the denominator has to be the same,
Finding the LCM will make adding and subtracting fractions easier.
first find a common denominator then subtract the top numbers
To add and subtract unlike fractions.
When you want to add or subtract unlike fractions.
because its just one of the rules of math :)
Convert unlike fractions to equivalent fractions with common denominators by finding the LCM of the denominators.
To get the right answer when you add or subtract unlike fractions.
Because to add fractions, the denominators must be equal.
-1/2+7/10
The question is based on a complete misunderstanding of what is required. Unlike denominators are NOT required!
It will help when you want to add and subtract unlike fractions.