Add 5/70 and 81/90
5/70 + 81/90 is 34/35.
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,
5/70 = 5 × 9/70 × 9 = 45/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
81/90 = 81 × 7/90 × 7 = 567/630 - Add the two like fractions:
45/630 + 567/630 = 45 + 567/630 = 612/630 - 612/630 simplified gives 34/35
- So, 5/70 + 81/90 = 34/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/70+81/90 15/70+81/90 25/70+81/90 35/70+81/90