Add 42/80 and 28/70
42/80 + 28/70 is 37/40.
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,
28/70 = 28 × 8/70 × 8 = 224/560 - Add the two like fractions:
294/560 + 224/560 = 294 + 224/560 = 518/560 - 518/560 simplified gives 37/40
- So, 42/80 + 28/70 = 37/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/80+28/70 42/80+56/70 42/80+84/70