Subtract 18/50 from 21/28
21/28 - 18/50 is 39/100.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 50 is 700
Next, find the equivalent fraction of both fractional numbers with denominator 700 - For the 1st fraction, since 28 × 25 = 700,
21/28 = 21 × 25/28 × 25 = 525/700 - Likewise, for the 2nd fraction, since 50 × 14 = 700,
18/50 = 18 × 14/50 × 14 = 252/700 - Subtract the two like fractions:
525/700 - 252/700 = 525 - 252/700 = 273/700 - After reducing the fraction, the answer is 39/100
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28-18/50 21/28-36/50 21/56-18/50 63/28-18/50 21/28-54/50 21/84-18/50 21/28-90/50