Add 42/72 and 30/20
1st number: 42/72, 2nd number: 1 10/20
42/72 + 30/20 is 25/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 20 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
42/72 = 42 × 5/72 × 5 = 210/360 - Likewise, for the 2nd fraction, since 20 × 18 = 360,
30/20 = 30 × 18/20 × 18 = 540/360 - Add the two like fractions:
210/360 + 540/360 = 210 + 540/360 = 750/360 - 750/360 simplified gives 25/12
- So, 42/72 + 30/20 = 25/12
In mixed form: 21/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/72+30/20 42/72+60/20 42/72+30/40 42/72+90/20 42/72+30/60