Add 42/80 and 35/42
42/80 + 35/42 is 163/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 42 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
42/80 = 42 × 21/80 × 21 = 882/1680 - Likewise, for the 2nd fraction, since 42 × 40 = 1680,
35/42 = 35 × 40/42 × 40 = 1400/1680 - Add the two like fractions:
882/1680 + 1400/1680 = 882 + 1400/1680 = 2282/1680 - 2282/1680 simplified gives 163/120
- So, 42/80 + 35/42 = 163/120
In mixed form: 143/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/80+35/42 42/80+70/42 42/80+35/84