Add 7/30 and 36/21
1st number: 7/30, 2nd number: 1 15/21
7/30 + 36/21 is 409/210.
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,
36/21 = 36 × 10/21 × 10 = 360/210 - Add the two like fractions:
49/210 + 360/210 = 49 + 360/210 = 409/210 - So, 7/30 + 36/21 = 409/210
In mixed form: 1199/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/30+36/21 7/30+72/21 7/60+36/21 7/30+36/42 21/30+36/21 7/90+36/21 7/30+36/63 35/30+36/21 49/30+36/21