Subtract 21/40 from 1/45
1/45 - 21/40 is -181/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 45 × 8 = 360,
1/45 = 1 × 8/45 × 8 = 8/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
21/40 = 21 × 9/40 × 9 = 189/360 - Subtract the two like fractions:
8/360 - 189/360 = 8 - 189/360 = -181/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/45-21/40 1/45-42/40 1/90-21/40 1/45-21/80 3/45-21/40 1/45-63/40 5/45-21/40 7/45-21/40