Add 42/70 and 20/56
42/70 + 20/56 is 67/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 56 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
42/70 = 42 × 4/70 × 4 = 168/280 - Likewise, for the 2nd fraction, since 56 × 5 = 280,
20/56 = 20 × 5/56 × 5 = 100/280 - Add the two like fractions:
168/280 + 100/280 = 168 + 100/280 = 268/280 - 268/280 simplified gives 67/70
- So, 42/70 + 20/56 = 67/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/70+20/56 42/70+40/56 42/70+60/56