Subtract 72/45 from 4/42
1st number: 4/42, 2nd number: 1 27/45
4/42 - 72/45 is -158/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 45 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
4/42 = 4 × 15/42 × 15 = 60/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
72/45 = 72 × 14/45 × 14 = 1008/630 - Subtract the two like fractions:
60/630 - 1008/630 = 60 - 1008/630 = -948/630 - After reducing the fraction, the answer is -158/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/42-72/45 4/84-72/45 4/42-72/90 12/42-72/45 20/42-72/45 28/42-72/45