Add 20/30 and 12/7
1st number: 20/30, 2nd number: 1 5/7
20/30 + 12/7 is 50/21.
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,
20/30 = 20 × 7/30 × 7 = 140/210 - Likewise, for the 2nd fraction, since 7 × 30 = 210,
12/7 = 12 × 30/7 × 30 = 360/210 - Add the two like fractions:
140/210 + 360/210 = 140 + 360/210 = 500/210 - 500/210 simplified gives 50/21
- So, 20/30 + 12/7 = 50/21
In mixed form: 28/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/30+12/7 20/30+24/7 20/60+12/7 20/30+12/14 60/30+12/7 20/30+36/7 20/90+12/7 20/30+12/21 20/30+60/7 20/30+12/35 20/30+84/7 20/30+12/49