Add 7/30 and 54/21
1st number: 7/30, 2nd number: 2 12/21
7/30 + 54/21 is 589/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
7/30 = 7 × 7/30 × 7 = 49/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
54/21 = 54 × 10/21 × 10 = 540/210 - Add the two like fractions:
49/210 + 540/210 = 49 + 540/210 = 589/210 - So, 7/30 + 54/21 = 589/210
In mixed form: 2169/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/30+54/21 7/60+54/21 7/30+54/42 21/30+54/21 7/90+54/21 7/30+54/63 35/30+54/21 49/30+54/21