Subtract 5/45 from 4/42
4/42 - 5/45 is -1/63.
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,
5/45 = 5 × 14/45 × 14 = 70/630 - Subtract the two like fractions:
60/630 - 70/630 = 60 - 70/630 = -10/630 - After reducing the fraction, the answer is -1/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/42-5/45 4/42-10/45 4/84-5/45 4/42-5/90 12/42-5/45 4/42-15/45 20/42-5/45 4/42-25/45 28/42-5/45 4/42-35/45