Subtract 90/21 from 75/4
1st number: 18 3/4, 2nd number: 4 6/21
75/4 - 90/21 is 405/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
75/4 = 75 × 21/4 × 21 = 1575/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
90/21 = 90 × 4/21 × 4 = 360/84 - Subtract the two like fractions:
1575/84 - 360/84 = 1575 - 360/84 = 1215/84 - After reducing the fraction, the answer is 405/28
- In mixed form: 1413/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/8-90/21 75/4-90/42 75/12-90/21 75/4-90/63 75/20-90/21 75/28-90/21