Subtract 9/40 from 9/45
9/45 - 9/40 is -1/40.
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,
9/45 = 9 × 8/45 × 8 = 72/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
9/40 = 9 × 9/40 × 9 = 81/360 - Subtract the two like fractions:
72/360 - 81/360 = 72 - 81/360 = -9/360 - After reducing the fraction, the answer is -1/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/45-9/40 9/45-18/40 9/90-9/40 9/45-9/80 27/45-9/40 9/45-27/40 9/45-45/40 63/45-9/40 9/45-63/40