Subtract 27/30 from 12/7
1st number: 1 5/7, 2nd number: 27/30
12/7 - 27/30 is 57/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 7 × 30 = 210,
12/7 = 12 × 30/7 × 30 = 360/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
27/30 = 27 × 7/30 × 7 = 189/210 - Subtract the two like fractions:
360/210 - 189/210 = 360 - 189/210 = 171/210 - After reducing the fraction, the answer is 57/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/7-27/30 12/7-54/30 12/14-27/30 12/7-27/60 36/7-27/30 12/7-81/30 12/21-27/30 12/7-27/90 60/7-27/30 12/35-27/30 84/7-27/30 12/49-27/30