Add 70/21 and 8/42
1st number: 3 7/21, 2nd number: 8/42
70/21 + 8/42 is 74/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
70/21 = 70 × 2/21 × 2 = 140/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
8/42 = 8 × 1/42 × 1 = 8/42 - Add the two like fractions:
140/42 + 8/42 = 140 + 8/42 = 148/42 - 148/42 simplified gives 74/21
- So, 70/21 + 8/42 = 74/21
In mixed form: 311/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21+16/42 70/42+8/42 70/21+8/84 70/21+24/42 70/63+8/42 70/21+40/42 70/21+56/42