Add 36/24 and 90/21
1st number: 1 12/24, 2nd number: 4 6/21
36/24 + 90/21 is 81/14.
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,
36/24 = 36 × 7/24 × 7 = 252/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
90/21 = 90 × 8/21 × 8 = 720/168 - Add the two like fractions:
252/168 + 720/168 = 252 + 720/168 = 972/168 - 972/168 simplified gives 81/14
- So, 36/24 + 90/21 = 81/14
In mixed form: 511/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/24+90/21 36/48+90/21 36/24+90/42 36/72+90/21 36/24+90/63