Subtract 7/42 from 40/45
40/45 - 7/42 is 13/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 42 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 45 × 14 = 630,
40/45 = 40 × 14/45 × 14 = 560/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
7/42 = 7 × 15/42 × 15 = 105/630 - Subtract the two like fractions:
560/630 - 105/630 = 560 - 105/630 = 455/630 - After reducing the fraction, the answer is 13/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/45-7/42 40/45-14/42 40/90-7/42 40/45-7/84 40/45-21/42 40/45-35/42 40/45-49/42