Subtract 5/42 from 7/45
7/45 - 5/42 is 23/630.
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,
7/45 = 7 × 14/45 × 14 = 98/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
5/42 = 5 × 15/42 × 15 = 75/630 - Subtract the two like fractions:
98/630 - 75/630 = 98 - 75/630 = 23/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/45-5/42 7/45-10/42 7/90-5/42 7/45-5/84 21/45-5/42 7/45-15/42 35/45-5/42 7/45-25/42 49/45-5/42 7/45-35/42