Add 42/20 and 70/28
1st number: 2 2/20, 2nd number: 2 14/28
42/20 + 70/28 is 23/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
42/20 = 42 × 7/20 × 7 = 294/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
70/28 = 70 × 5/28 × 5 = 350/140 - Add the two like fractions:
294/140 + 350/140 = 294 + 350/140 = 644/140 - 644/140 simplified gives 23/5
- So, 42/20 + 70/28 = 23/5
In mixed form: 43/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/20+70/28 42/40+70/28 42/20+70/56 42/60+70/28 42/20+70/84