Subtract 7/45 from 12/42
12/42 - 7/45 is 41/315.
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,
12/42 = 12 × 15/42 × 15 = 180/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
7/45 = 7 × 14/45 × 14 = 98/630 - Subtract the two like fractions:
180/630 - 98/630 = 180 - 98/630 = 82/630 - After reducing the fraction, the answer is 41/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/42-7/45 12/42-14/45 12/84-7/45 12/42-7/90 36/42-7/45 12/42-21/45 60/42-7/45 12/42-35/45 84/42-7/45 12/42-49/45