Subtract 18/45 from 90/21
1st number: 4 6/21, 2nd number: 18/45
90/21 - 18/45 is 136/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 21 × 15 = 315,
90/21 = 90 × 15/21 × 15 = 1350/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
18/45 = 18 × 7/45 × 7 = 126/315 - Subtract the two like fractions:
1350/315 - 126/315 = 1350 - 126/315 = 1224/315 - After reducing the fraction, the answer is 136/35
- In mixed form: 331/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-36/45 90/42-18/45 90/21-18/90 90/21-54/45 90/63-18/45 90/21-90/45