Subtract 42/20 from 7/40
1st number: 7/40, 2nd number: 2 2/20
7/40 - 42/20 is -77/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 20 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 40 × 1 = 40,
7/40 = 7 × 1/40 × 1 = 7/40 - Likewise, for the 2nd fraction, since 20 × 2 = 40,
42/20 = 42 × 2/20 × 2 = 84/40 - Subtract the two like fractions:
7/40 - 84/40 = 7 - 84/40 = -77/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/40-42/20 7/40-84/20 7/80-42/20 7/40-42/40 21/40-42/20 7/40-42/60 35/40-42/20 49/40-42/20