Subtract 21/16 from 27/30
1st number: 27/30, 2nd number: 1 5/16
27/30 - 21/16 is -33/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 16 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 30 × 8 = 240,
27/30 = 27 × 8/30 × 8 = 216/240 - Likewise, for the 2nd fraction, since 16 × 15 = 240,
21/16 = 21 × 15/16 × 15 = 315/240 - Subtract the two like fractions:
216/240 - 315/240 = 216 - 315/240 = -99/240 - After reducing the fraction, the answer is -33/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/30-21/16 27/30-42/16 27/60-21/16 27/30-21/32 81/30-21/16 27/30-63/16 27/90-21/16 27/30-21/48 27/30-21/80