Add 72/42 and 80/90
1st number: 1 30/42, 2nd number: 80/90
72/42 + 80/90 is 164/63.
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,
72/42 = 72 × 15/42 × 15 = 1080/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
80/90 = 80 × 7/90 × 7 = 560/630 - Add the two like fractions:
1080/630 + 560/630 = 1080 + 560/630 = 1640/630 - 1640/630 simplified gives 164/63
- So, 72/42 + 80/90 = 164/63
In mixed form: 238/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/84+80/90