Subtract 42/40 from 9/7
1st number: 1 2/7, 2nd number: 1 2/40
9/7 - 42/40 is 33/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 7 × 40 = 280,
9/7 = 9 × 40/7 × 40 = 360/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
42/40 = 42 × 7/40 × 7 = 294/280 - Subtract the two like fractions:
360/280 - 294/280 = 360 - 294/280 = 66/280 - After reducing the fraction, the answer is 33/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/7-42/40 9/7-84/40 9/14-42/40 9/7-42/80 27/7-42/40 9/21-42/40 45/7-42/40 9/35-42/40 63/7-42/40 9/49-42/40