Answers

Subtract 21/63 from 5/70

5/70 - 21/63 is -11/42.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 63 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 70 × 9 = 630,
   5/70 = 5 × 9/70 × 9 = 45/630
3. Likewise, for the 2nd fraction, since 63 × 10 = 630,
   21/63 = 21 × 10/63 × 10 = 210/630
4. Subtract the two like fractions:
   45/630 - 210/630 = 45 - 210/630 = -165/630
5. After reducing the fraction, the answer is -11/42

MathStep (Works offline)

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

Related: ¹⁰/₇₀-²¹/₆₃ ⁵/₇₀-⁴²/₆₃ ¹⁵/₇₀-²¹/₆₃ ²⁵/₇₀-²¹/₆₃ ³⁵/₇₀-²¹/₆₃

Subtract Fractions Calculator