Add 20/72 and 42/30
1st number: 20/72, 2nd number: 1 12/30
20/72 + 42/30 is 151/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 30 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
20/72 = 20 × 5/72 × 5 = 100/360 - Likewise, for the 2nd fraction, since 30 × 12 = 360,
42/30 = 42 × 12/30 × 12 = 504/360 - Add the two like fractions:
100/360 + 504/360 = 100 + 504/360 = 604/360 - 604/360 simplified gives 151/90
- So, 20/72 + 42/30 = 151/90
In mixed form: 161/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/72+42/30 20/72+84/30 20/72+42/60 60/72+42/30 20/72+42/90