Add 7/70 and 42/90
7/70 + 42/90 is 17/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
7/70 = 7 × 9/70 × 9 = 63/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
42/90 = 42 × 7/90 × 7 = 294/630 - Add the two like fractions:
63/630 + 294/630 = 63 + 294/630 = 357/630 - 357/630 simplified gives 17/30
- So, 7/70 + 42/90 = 17/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/70+42/90 7/70+84/90 21/70+42/90 35/70+42/90 49/70+42/90