Add 21/30 and 45/7
1st number: 21/30, 2nd number: 6 3/7
21/30 + 45/7 is 499/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 7 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
21/30 = 21 × 7/30 × 7 = 147/210 - Likewise, for the 2nd fraction, since 7 × 30 = 210,
45/7 = 45 × 30/7 × 30 = 1350/210 - Add the two like fractions:
147/210 + 1350/210 = 147 + 1350/210 = 1497/210 - 1497/210 simplified gives 499/70
- So, 21/30 + 45/7 = 499/70
In mixed form: 79/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+45/7 21/30+90/7 21/60+45/7 21/30+45/14 63/30+45/7 21/90+45/7 21/30+45/21 21/30+45/35 21/30+45/49