Add 84/70 and 42/80
1st number: 1 14/70, 2nd number: 42/80
84/70 + 42/80 is 69/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 70 × 8 = 560,
84/70 = 84 × 8/70 × 8 = 672/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
42/80 = 42 × 7/80 × 7 = 294/560 - Add the two like fractions:
672/560 + 294/560 = 672 + 294/560 = 966/560 - 966/560 simplified gives 69/40
- So, 84/70 + 42/80 = 69/40
In mixed form: 129/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/70+84/80