Add 15/70 and 42/40
1st number: 15/70, 2nd number: 1 2/40
15/70 + 42/40 is 177/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
15/70 = 15 × 4/70 × 4 = 60/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
42/40 = 42 × 7/40 × 7 = 294/280 - Add the two like fractions:
60/280 + 294/280 = 60 + 294/280 = 354/280 - 354/280 simplified gives 177/140
- So, 15/70 + 42/40 = 177/140
In mixed form: 137/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/70+42/40 15/70+84/40 15/70+42/80 45/70+42/40 75/70+42/40