Answers

Subtract 50/70 from 21/50

21/50 - 50/70 is -103/350.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 50 and 70 is 350
   
   Next, find the equivalent fraction of both fractional numbers with denominator 350
2. For the 1st fraction, since 50 × 7 = 350,
   21/50 = 21 × 7/50 × 7 = 147/350
3. Likewise, for the 2nd fraction, since 70 × 5 = 350,
   50/70 = 50 × 5/70 × 5 = 250/350
4. Subtract the two like fractions:
   147/350 - 250/350 = 147 - 250/350 = -103/350

MathStep (Works offline)

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

Related: ⁴²/₅₀-⁵⁰/₇₀ ⁶³/₅₀-⁵⁰/₇₀

Subtract Fractions Calculator