Subtract 40/21 from 15/60
1st number: 15/60, 2nd number: 1 19/21
15/60 - 40/21 is -139/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 60 × 7 = 420,
15/60 = 15 × 7/60 × 7 = 105/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
40/21 = 40 × 20/21 × 20 = 800/420 - Subtract the two like fractions:
105/420 - 800/420 = 105 - 800/420 = -695/420 - After reducing the fraction, the answer is -139/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/60-40/21 15/60-80/21 15/60-40/42 45/60-40/21 15/60-40/63 75/60-40/21