Because you can't add or subtract fractions that have different denominators. Making them like fractions, by multiplying so the denominators are the same, you can add and/or subtract them.
In fractions, you can NEVER add or subtract
Make the fractions equivalent then subtract
Because to add or subtract two fractions you first have to find equivalent fractions for both which have the same denominator.
To subtract fractions with like denominators, subtract the numerators , and write the difference over the denominator. Example : Find 45−25 . Since the denominators are the same, subtract the numerators.
multiply the fractions until they have common denominators and then subtract them
You need a common denominator in order to add or subtract fractions.
To subtract a mixed number by a mixed number you first need to turn the fractions into improper fractions then you just subtract them as you would with the normal fractions
it stay the same when you subtract fractions and when you add fractions.
Because think of like fractions as the same things.. you can subtract halves from halves for example, but what does it mean to take away a half from a third?By converting them into like fractions, we can add or subtract them easily.
It means you have to subtract fractions.
Once you find the LCD, convert the fractions to their equivalents and then you can add and/or subtract them correctly.
I am not entirely sure what you mean, but if you need to add, subtract, or compare two fractions, they need to have the same denominator.
no, to add and subtract like and unlike fractions the denominator has to be the same,
First find the lowest common denominator and then adjust the fractions accordingly before subtracting the numerators
by finding the common denominator of the fractions
subtract the top two and the bottom stays the same.....for example; 4/8-3/8=1/8
Subtract the smaller fraction from the larger one.
It is: 56
If the denominators are the same, subtract the numerators. If the denominators are different, convert them to equivalent fractions with a common denominator and subtract the numerators.
you subtract the numerators, and leeave the denomonators alone
By finding the lowest common denominator of the fractions.