Subtract 18/30 from 21/4
1st number: 5 1/4, 2nd number: 18/30
21/4 - 18/30 is 93/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 30 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 4 × 15 = 60,
21/4 = 21 × 15/4 × 15 = 315/60 - Likewise, for the 2nd fraction, since 30 × 2 = 60,
18/30 = 18 × 2/30 × 2 = 36/60 - Subtract the two like fractions:
315/60 - 36/60 = 315 - 36/60 = 279/60 - After reducing the fraction, the answer is 93/20
- In mixed form: 413/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4-18/30 21/4-36/30 21/8-18/30 21/4-18/60 63/4-18/30 21/4-54/30 21/12-18/30 21/4-18/90 21/4-90/30 21/20-18/30 21/28-18/30