Subtract 16/20 from 3/81
3/81 - 16/20 is -103/135.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 20 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 81 × 20 = 1620,
3/81 = 3 × 20/81 × 20 = 60/1620 - Likewise, for the 2nd fraction, since 20 × 81 = 1620,
16/20 = 16 × 81/20 × 81 = 1296/1620 - Subtract the two like fractions:
60/1620 - 1296/1620 = 60 - 1296/1620 = -1236/1620 - After reducing the fraction, the answer is -103/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/81-16/20 3/81-32/20 3/81-16/40 9/81-16/20 3/81-48/20 3/81-16/60 15/81-16/20 3/81-80/20 21/81-16/20