Subtract 21/49 from 1/45
1/45 - 21/49 is -128/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 49 is 2205
Next, find the equivalent fraction of both fractional numbers with denominator 2205 - For the 1st fraction, since 45 × 49 = 2205,
1/45 = 1 × 49/45 × 49 = 49/2205 - Likewise, for the 2nd fraction, since 49 × 45 = 2205,
21/49 = 21 × 45/49 × 45 = 945/2205 - Subtract the two like fractions:
49/2205 - 945/2205 = 49 - 945/2205 = -896/2205 - After reducing the fraction, the answer is -128/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/45-21/49 1/45-42/49 1/90-21/49 1/45-21/98 3/45-21/49 1/45-63/49 5/45-21/49 7/45-21/49