Answers

Subtract 25/81 from 3/70

3/70 - 25/81 is -1507/5670.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 81 is 5670
   
   Next, find the equivalent fraction of both fractional numbers with denominator 5670
2. For the 1st fraction, since 70 × 81 = 5670,
   3/70 = 3 × 81/70 × 81 = 243/5670
3. Likewise, for the 2nd fraction, since 81 × 70 = 5670,
   25/81 = 25 × 70/81 × 70 = 1750/5670
4. Subtract the two like fractions:
   243/5670 - 1750/5670 = 243 - 1750/5670 = -1507/5670

MathStep (Works offline)

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

Related: ⁶/₇₀-²⁵/₈₁ ³/₇₀-⁵⁰/₈₁ ⁹/₇₀-²⁵/₈₁ ³/₇₀-⁷⁵/₈₁ ¹⁵/₇₀-²⁵/₈₁ ²¹/₇₀-²⁵/₈₁

Subtract Fractions Calculator