Answers

Subtract 75/70 from 70/90

1^st number: 70/90, 2^nd number: 1 5/70

70/90 - 75/70 is -37/126.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 70 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 90 × 7 = 630,
   70/90 = 70 × 7/90 × 7 = 490/630
3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
   75/70 = 75 × 9/70 × 9 = 675/630
4. Subtract the two like fractions:
   490/630 - 675/630 = 490 - 675/630 = -185/630
5. After reducing the fraction, the answer is -37/126

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related:

Subtract Fractions Calculator