Subtract 45/21 from 16/8
1st number: 2 0/8, 2nd number: 2 3/21
16/8 - 45/21 is -1/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
16/8 = 16 × 21/8 × 21 = 336/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
45/21 = 45 × 8/21 × 8 = 360/168 - Subtract the two like fractions:
336/168 - 360/168 = 336 - 360/168 = -24/168 - After reducing the fraction, the answer is -1/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/8-45/21 16/8-90/21 16/8-45/42 48/8-45/21 16/24-45/21 16/8-45/63 80/8-45/21 16/40-45/21 16/56-45/21