Subtract 21/40 from 9/35
9/35 - 21/40 is -15/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 35 × 8 = 280,
9/35 = 9 × 8/35 × 8 = 72/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
21/40 = 21 × 7/40 × 7 = 147/280 - Subtract the two like fractions:
72/280 - 147/280 = 72 - 147/280 = -75/280 - After reducing the fraction, the answer is -15/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/35-21/40 9/35-42/40 9/70-21/40 9/35-21/80 27/35-21/40 9/35-63/40 45/35-21/40 63/35-21/40