Add 90/6 and 5/21
1st number: 15 0/6, 2nd number: 5/21
90/6 + 5/21 is 320/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 6 × 7 = 42,
90/6 = 90 × 7/6 × 7 = 630/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
5/21 = 5 × 2/21 × 2 = 10/42 - Add the two like fractions:
630/42 + 10/42 = 630 + 10/42 = 640/42 - 640/42 simplified gives 320/21
- So, 90/6 + 5/21 = 320/21
In mixed form: 155/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/6+10/21 90/12+5/21 90/6+5/42 90/6+15/21 90/18+5/21 90/6+5/63 90/6+25/21 90/30+5/21 90/6+35/21 90/42+5/21