Add 8/70 and 21/42
8/70 + 21/42 is 43/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
8/70 = 8 × 3/70 × 3 = 24/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
21/42 = 21 × 5/42 × 5 = 105/210 - Add the two like fractions:
24/210 + 105/210 = 24 + 105/210 = 129/210 - 129/210 simplified gives 43/70
- So, 8/70 + 21/42 = 43/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/70+21/42 8/70+21/84 24/70+21/42 8/70+63/42 40/70+21/42 56/70+21/42