Subtract 40/30 from 3/7
1st number: 3/7, 2nd number: 1 10/30
3/7 - 40/30 is -19/21.
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,
3/7 = 3 × 30/7 × 30 = 90/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
40/30 = 40 × 7/30 × 7 = 280/210 - Subtract the two like fractions:
90/210 - 280/210 = 90 - 280/210 = -190/210 - After reducing the fraction, the answer is -19/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/7-40/30 3/7-80/30 3/14-40/30 3/7-40/60 9/7-40/30 3/21-40/30 3/7-40/90 15/7-40/30 3/35-40/30 21/7-40/30 3/49-40/30