Add 7/20 and 72/42
1st number: 7/20, 2nd number: 1 30/42
7/20 + 72/42 is 289/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
7/20 = 7 × 21/20 × 21 = 147/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
72/42 = 72 × 10/42 × 10 = 720/420 - Add the two like fractions:
147/420 + 720/420 = 147 + 720/420 = 867/420 - 867/420 simplified gives 289/140
- So, 7/20 + 72/42 = 289/140
In mixed form: 29/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/20+72/42 7/40+72/42 7/20+72/84 21/20+72/42 7/60+72/42 35/20+72/42 49/20+72/42