Add 4/42 and 90/70
1st number: 4/42, 2nd number: 1 20/70
4/42 + 90/70 is 29/21.
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,
4/42 = 4 × 5/42 × 5 = 20/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
90/70 = 90 × 3/70 × 3 = 270/210 - Add the two like fractions:
20/210 + 270/210 = 20 + 270/210 = 290/210 - 290/210 simplified gives 29/21
- So, 4/42 + 90/70 = 29/21
In mixed form: 18/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/42+90/70 4/84+90/70 12/42+90/70 20/42+90/70 28/42+90/70