Add 7/15 and 12/42
7/15 + 12/42 is 79/105.
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,
7/15 = 7 × 14/15 × 14 = 98/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
12/42 = 12 × 5/42 × 5 = 60/210 - Add the two like fractions:
98/210 + 60/210 = 98 + 60/210 = 158/210 - 158/210 simplified gives 79/105
- So, 7/15 + 12/42 = 79/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/15+12/42 7/15+24/42 7/30+12/42 7/15+12/84 21/15+12/42 7/15+36/42 7/45+12/42 35/15+12/42 7/15+60/42 7/75+12/42 49/15+12/42 7/15+84/42