Add 15/35 and 12/42
15/35 + 12/42 is 5/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 35 × 6 = 210,
15/35 = 15 × 6/35 × 6 = 90/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
12/42 = 12 × 5/42 × 5 = 60/210 - Add the two like fractions:
90/210 + 60/210 = 90 + 60/210 = 150/210 - 150/210 simplified gives 5/7
- So, 15/35 + 12/42 = 5/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/35+12/42 15/35+24/42 15/70+12/42 15/35+12/84 45/35+12/42 15/35+36/42 75/35+12/42 15/35+60/42 15/35+84/42