Subtract 30/40 from 10/45
10/45 - 30/40 is -19/36.
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,
10/45 = 10 × 8/45 × 8 = 80/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
30/40 = 30 × 9/40 × 9 = 270/360 - Subtract the two like fractions:
80/360 - 270/360 = 80 - 270/360 = -190/360 - After reducing the fraction, the answer is -19/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/45-30/40 10/45-60/40 10/90-30/40 10/45-30/80 30/45-30/40 10/45-90/40 50/45-30/40 70/45-30/40