Add 7/90 and 80/42
1st number: 7/90, 2nd number: 1 38/42
7/90 + 80/42 is 1249/630.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 42 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
7/90 = 7 × 7/90 × 7 = 49/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
80/42 = 80 × 15/42 × 15 = 1200/630 - Add the two like fractions:
49/630 + 1200/630 = 49 + 1200/630 = 1249/630 - So, 7/90 + 80/42 = 1249/630
In mixed form: 1619/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/90+80/42 7/90+80/84 21/90+80/42 35/90+80/42 49/90+80/42