Add 42/80 and 56/70
42/80 + 56/70 is 53/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 70 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 80 × 7 = 560,
42/80 = 42 × 7/80 × 7 = 294/560 - Likewise, for the 2nd fraction, since 70 × 8 = 560,
56/70 = 56 × 8/70 × 8 = 448/560 - Add the two like fractions:
294/560 + 448/560 = 294 + 448/560 = 742/560 - 742/560 simplified gives 53/40
- So, 42/80 + 56/70 = 53/40
In mixed form: 113/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/80+56/70