Subtract 7/45 from 42/49
42/49 - 7/45 is 221/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 45 is 2205
Next, find the equivalent fraction of both fractional numbers with denominator 2205 - For the 1st fraction, since 49 × 45 = 2205,
42/49 = 42 × 45/49 × 45 = 1890/2205 - Likewise, for the 2nd fraction, since 45 × 49 = 2205,
7/45 = 7 × 49/45 × 49 = 343/2205 - Subtract the two like fractions:
1890/2205 - 343/2205 = 1890 - 343/2205 = 1547/2205 - After reducing the fraction, the answer is 221/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/49-7/45 42/49-14/45 42/98-7/45 42/49-7/90 42/49-21/45 42/49-35/45 42/49-49/45