Subtract 30/5 from 21/72
1st number: 21/72, 2nd number: 6 0/5
21/72 - 30/5 is -137/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 5 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
21/72 = 21 × 5/72 × 5 = 105/360 - Likewise, for the 2nd fraction, since 5 × 72 = 360,
30/5 = 30 × 72/5 × 72 = 2160/360 - Subtract the two like fractions:
105/360 - 2160/360 = 105 - 2160/360 = -2055/360 - After reducing the fraction, the answer is -137/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/72-30/5 21/72-60/5 21/72-30/10 63/72-30/5 21/72-90/5 21/72-30/15 21/72-30/25 21/72-30/35