Add 20/24 and 40/21
1st number: 20/24, 2nd number: 1 19/21
20/24 + 40/21 is 115/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 24 × 7 = 168,
20/24 = 20 × 7/24 × 7 = 140/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
40/21 = 40 × 8/21 × 8 = 320/168 - Add the two like fractions:
140/168 + 320/168 = 140 + 320/168 = 460/168 - 460/168 simplified gives 115/42
- So, 20/24 + 40/21 = 115/42
In mixed form: 231/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/24+40/21 20/24+80/21 20/48+40/21 20/24+40/42 60/24+40/21 20/72+40/21 20/24+40/63