Add 42/5 and 70/21
1st number: 8 2/5, 2nd number: 3 7/21
42/5 + 70/21 is 176/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
42/5 = 42 × 21/5 × 21 = 882/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
70/21 = 70 × 5/21 × 5 = 350/105 - Add the two like fractions:
882/105 + 350/105 = 882 + 350/105 = 1232/105 - 1232/105 simplified gives 176/15
- So, 42/5 + 70/21 = 176/15
In mixed form: 1111/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/5+70/21 42/10+70/21 42/5+70/42 42/15+70/21 42/5+70/63 42/25+70/21 42/35+70/21