Add 21/7 and 90/10
1st number: 3 0/7, 2nd number: 9 0/10
21/7 + 90/10 is 12/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 10 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 7 × 10 = 70,
21/7 = 21 × 10/7 × 10 = 210/70 - Likewise, for the 2nd fraction, since 10 × 7 = 70,
90/10 = 90 × 7/10 × 7 = 630/70 - Add the two like fractions:
210/70 + 630/70 = 210 + 630/70 = 840/70 - 840/70 simplified gives 12/1
- So, 21/7 + 90/10 = 12/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7+90/10 21/14+90/10 21/7+90/20 63/7+90/10 21/7+90/30 21/35+90/10 21/7+90/50 21/49+90/10 21/7+90/70