Add 7/42 and 72/90
7/42 + 72/90 is 29/30.
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,
7/42 = 7 × 15/42 × 15 = 105/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
72/90 = 72 × 7/90 × 7 = 504/630 - Add the two like fractions:
105/630 + 504/630 = 105 + 504/630 = 609/630 - 609/630 simplified gives 29/30
- So, 7/42 + 72/90 = 29/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/42+72/90 7/84+72/90 21/42+72/90 35/42+72/90 49/42+72/90