Add 90/24 and 8/21
1st number: 3 18/24, 2nd number: 8/21
90/24 + 8/21 is 347/84.
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,
90/24 = 90 × 7/24 × 7 = 630/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
8/21 = 8 × 8/21 × 8 = 64/168 - Add the two like fractions:
630/168 + 64/168 = 630 + 64/168 = 694/168 - 694/168 simplified gives 347/84
- So, 90/24 + 8/21 = 347/84
In mixed form: 411/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/24+16/21 90/48+8/21 90/24+8/42 90/24+24/21 90/72+8/21 90/24+8/63 90/24+40/21 90/24+56/21