Add 42/70 and 12/42
42/70 + 12/42 is 31/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
42/70 = 42 × 3/70 × 3 = 126/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
12/42 = 12 × 5/42 × 5 = 60/210 - Add the two like fractions:
126/210 + 60/210 = 126 + 60/210 = 186/210 - 186/210 simplified gives 31/35
- So, 42/70 + 12/42 = 31/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/70+12/42 42/70+24/42 42/70+12/84 42/70+36/42 42/70+60/42 42/70+84/42