Subtract 40/20 from 1/45
1st number: 1/45, 2nd number: 2 0/20
1/45 - 40/20 is -89/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
1/45 = 1 × 4/45 × 4 = 4/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
40/20 = 40 × 9/20 × 9 = 360/180 - Subtract the two like fractions:
4/180 - 360/180 = 4 - 360/180 = -356/180 - After reducing the fraction, the answer is -89/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/45-40/20 1/45-80/20 1/90-40/20 3/45-40/20 1/45-40/60 5/45-40/20 7/45-40/20