Add 84/15 and 9/42
1st number: 5 9/15, 2nd number: 9/42
84/15 + 9/42 is 407/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 15 × 14 = 210,
84/15 = 84 × 14/15 × 14 = 1176/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
9/42 = 9 × 5/42 × 5 = 45/210 - Add the two like fractions:
1176/210 + 45/210 = 1176 + 45/210 = 1221/210 - 1221/210 simplified gives 407/70
- So, 84/15 + 9/42 = 407/70
In mixed form: 557/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/15+18/42 84/30+9/42 84/15+9/84 84/15+27/42 84/45+9/42 84/15+45/42 84/75+9/42 84/15+63/42