Add 90/42 and 20/70
1st number: 2 6/42, 2nd number: 20/70
90/42 + 20/70 is 17/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
90/42 = 90 × 5/42 × 5 = 450/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
20/70 = 20 × 3/70 × 3 = 60/210 - Add the two like fractions:
450/210 + 60/210 = 450 + 60/210 = 510/210 - 510/210 simplified gives 17/7
- So, 90/42 + 20/70 = 17/7
In mixed form: 23/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42+40/70 90/84+20/70 90/42+60/70