How to subtraction fractions?

Answer 1

To do this, first find the lowest common multiple, unless one is obvious.

Say 1/7 - 2/5 - 1/4 = ? Now the lowest common multiple of the denominators, (the bits at the bottom), is 7 x 5 x 4 = 140. check my math!!!

so we have 20/140 (for the 1/7), 28/140 (for the 2/5) and 35/140 (for the 1/4).

So for the curious example offered, we have (20 - 28 - 35) /140 which equals

-43/140. [check my math!!]

Answer 2

well you first check if there are mixed numbers (a number with a fraction at the end) if it is turn it into an improper fraction by multiplying the fractions denominator (bottom number) by the number then adding the asnwer to the numerator (top umber) then make sure they both have the same denominator by finding LCM, or if you don't know what that is just multiply them. remember that whatever you multiply the bottom number by you multiply the top number by! then when there all set you line the m up and subtract the top numbers only and put that over the same denomonator as the two other ones. if you can simplify you should :D that's my step by step guide, hope it helps!

Answer 3

you have to subtract Numerator NOT the denominator say 5\6 - 3\6= 5-3 =2 so the answer would be 2\6

Answer 4

Work it out yourself