Add 84/42 and 75/90
1st number: 2 0/42, 2nd number: 75/90
84/42 + 75/90 is 17/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
84/42 = 84 × 15/42 × 15 = 1260/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
75/90 = 75 × 7/90 × 7 = 525/630 - Add the two like fractions:
1260/630 + 525/630 = 1260 + 525/630 = 1785/630 - 1785/630 simplified gives 17/6
- So, 84/42 + 75/90 = 17/6
In mixed form: 25/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: