Subtract 84/21 from 1/45
1st number: 1/45, 2nd number: 4 0/21
1/45 - 84/21 is -179/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 21 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
1/45 = 1 × 7/45 × 7 = 7/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
84/21 = 84 × 15/21 × 15 = 1260/315 - Subtract the two like fractions:
7/315 - 1260/315 = 7 - 1260/315 = -1253/315 - After reducing the fraction, the answer is -179/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/45-84/21 1/90-84/21 1/45-84/42 3/45-84/21 1/45-84/63 5/45-84/21 7/45-84/21