Subtract 18/7 from 84/20
1st number: 4 4/20, 2nd number: 2 4/7
84/20 - 18/7 is 57/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 7 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
84/20 = 84 × 7/20 × 7 = 588/140 - Likewise, for the 2nd fraction, since 7 × 20 = 140,
18/7 = 18 × 20/7 × 20 = 360/140 - Subtract the two like fractions:
588/140 - 360/140 = 588 - 360/140 = 228/140 - After reducing the fraction, the answer is 57/35
- In mixed form: 122/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/20-36/7 84/40-18/7 84/20-18/14 84/20-54/7 84/60-18/7 84/20-18/21 84/20-90/7 84/20-18/35 84/20-18/49