Answers

Subtract 40/70 from 3/90

3/90 - 40/70 is -113/210.

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,
   3/90 = 3 × 7/90 × 7 = 21/630
3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
   40/70 = 40 × 9/70 × 9 = 360/630
4. Subtract the two like fractions:
   21/630 - 360/630 = 21 - 360/630 = -339/630
5. After reducing the fraction, the answer is -113/210

MathStep (Works offline)

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

Related: ⁶/₉₀-⁴⁰/₇₀ ³/₉₀-⁸⁰/₇₀ ⁹/₉₀-⁴⁰/₇₀ ¹⁵/₉₀-⁴⁰/₇₀ ²¹/₉₀-⁴⁰/₇₀

Subtract Fractions Calculator