Answers

Subtract 21/80 from 24/70

24/70 - 21/80 is 9/112.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 80 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 70 × 8 = 560,
   24/70 = 24 × 8/70 × 8 = 192/560
3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
   21/80 = 21 × 7/80 × 7 = 147/560
4. Subtract the two like fractions:
   192/560 - 147/560 = 192 - 147/560 = 45/560
5. After reducing the fraction, the answer is 9/112

MathStep (Works offline)

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

Related: ⁴⁸/₇₀-²¹/₈₀ ²⁴/₇₀-⁴²/₈₀ ⁷²/₇₀-²¹/₈₀ ²⁴/₇₀-⁶³/₈₀

Subtract Fractions Calculator