Add 8/20 and 18/21
8/20 + 18/21 is 44/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
8/20 = 8 × 21/20 × 21 = 168/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
18/21 = 18 × 20/21 × 20 = 360/420 - Add the two like fractions:
168/420 + 360/420 = 168 + 360/420 = 528/420 - 528/420 simplified gives 44/35
- So, 8/20 + 18/21 = 44/35
In mixed form: 19/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/20+18/21 8/20+36/21 8/40+18/21 8/20+18/42 24/20+18/21 8/20+54/21 8/60+18/21 8/20+18/63 40/20+18/21 8/20+90/21 56/20+18/21