Subtract 10/45 from 3/42
3/42 - 10/45 is -19/126.
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,
3/42 = 3 × 15/42 × 15 = 45/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
10/45 = 10 × 14/45 × 14 = 140/630 - Subtract the two like fractions:
45/630 - 140/630 = 45 - 140/630 = -95/630 - After reducing the fraction, the answer is -19/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/42-10/45 3/42-20/45 3/84-10/45 3/42-10/90 9/42-10/45 3/42-30/45 15/42-10/45 3/42-50/45 21/42-10/45 3/42-70/45