Subtract 42/70 from 3/45
3/45 - 42/70 is -8/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 45 × 14 = 630,
3/45 = 3 × 14/45 × 14 = 42/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
42/70 = 42 × 9/70 × 9 = 378/630 - Subtract the two like fractions:
42/630 - 378/630 = 42 - 378/630 = -336/630 - After reducing the fraction, the answer is -8/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/45-42/70 3/45-84/70 3/90-42/70 9/45-42/70 15/45-42/70 21/45-42/70