Subtract 21/25 from 1/42
1/42 - 21/25 is -857/1050.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 25 is 1050
Next, find the equivalent fraction of both fractional numbers with denominator 1050 - For the 1st fraction, since 42 × 25 = 1050,
1/42 = 1 × 25/42 × 25 = 25/1050 - Likewise, for the 2nd fraction, since 25 × 42 = 1050,
21/25 = 21 × 42/25 × 42 = 882/1050 - Subtract the two like fractions:
25/1050 - 882/1050 = 25 - 882/1050 = -857/1050
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/42-21/25 1/42-42/25 1/84-21/25 1/42-21/50 3/42-21/25 1/42-63/25 1/42-21/75 5/42-21/25 7/42-21/25