Add 35/8 and 90/21
1st number: 4 3/8, 2nd number: 4 6/21
35/8 + 90/21 is 485/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
35/8 = 35 × 21/8 × 21 = 735/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
90/21 = 90 × 8/21 × 8 = 720/168 - Add the two like fractions:
735/168 + 720/168 = 735 + 720/168 = 1455/168 - 1455/168 simplified gives 485/56
- So, 35/8 + 90/21 = 485/56
In mixed form: 837/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/8+90/21 35/16+90/21 35/8+90/42 35/24+90/21 35/8+90/63 35/40+90/21 35/56+90/21