Add 18/21 and 24/20
1st number: 18/21, 2nd number: 1 4/20
18/21 + 24/20 is 72/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
18/21 = 18 × 20/21 × 20 = 360/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
24/20 = 24 × 21/20 × 21 = 504/420 - Add the two like fractions:
360/420 + 504/420 = 360 + 504/420 = 864/420 - 864/420 simplified gives 72/35
- So, 18/21 + 24/20 = 72/35
In mixed form: 22/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+24/20 18/21+48/20 18/42+24/20 18/21+24/40 54/21+24/20 18/21+72/20 18/63+24/20 18/21+24/60 90/21+24/20