Subtract 21/40 from 75/45
1st number: 1 30/45, 2nd number: 21/40
75/45 - 21/40 is 137/120.
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,
75/45 = 75 × 8/45 × 8 = 600/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
21/40 = 21 × 9/40 × 9 = 189/360 - Subtract the two like fractions:
600/360 - 189/360 = 600 - 189/360 = 411/360 - After reducing the fraction, the answer is 137/120
- In mixed form: 117/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/45-42/40 75/90-21/40 75/45-21/80 75/45-63/40