Add 7/21 and 24/20
1st number: 7/21, 2nd number: 1 4/20
7/21 + 24/20 is 23/15.
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,
7/21 = 7 × 20/21 × 20 = 140/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
24/20 = 24 × 21/20 × 21 = 504/420 - Add the two like fractions:
140/420 + 504/420 = 140 + 504/420 = 644/420 - 644/420 simplified gives 23/15
- So, 7/21 + 24/20 = 23/15
In mixed form: 18/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+24/20 7/21+48/20 7/42+24/20 7/21+24/40 7/21+72/20 7/63+24/20 7/21+24/60 35/21+24/20 49/21+24/20