Subtract 12/40 from 9/4
1st number: 2 1/4, 2nd number: 12/40
9/4 - 12/40 is 39/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 4 × 10 = 40,
9/4 = 9 × 10/4 × 10 = 90/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
12/40 = 12 × 1/40 × 1 = 12/40 - Subtract the two like fractions:
90/40 - 12/40 = 90 - 12/40 = 78/40 - After reducing the fraction, the answer is 39/20
- In mixed form: 119/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/4-12/40 9/4-24/40 9/8-12/40 9/4-12/80 27/4-12/40 9/4-36/40 9/12-12/40 45/4-12/40 9/4-60/40 9/20-12/40 63/4-12/40 9/4-84/40 9/28-12/40