Subtract 3/70 from 20/40
20/40 - 3/70 is 16/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 70 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
20/40 = 20 × 7/40 × 7 = 140/280 - Likewise, for the 2nd fraction, since 70 × 4 = 280,
3/70 = 3 × 4/70 × 4 = 12/280 - Subtract the two like fractions:
140/280 - 12/280 = 140 - 12/280 = 128/280 - After reducing the fraction, the answer is 16/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40-6/70 20/80-3/70 60/40-3/70 20/40-9/70 20/40-15/70 20/40-21/70