Add 42/70 and 10/40
42/70 + 10/40 is 17/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 40 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 40 × 7 = 280,
10/40 = 10 × 7/40 × 7 = 70/280 - Add the two like fractions:
168/280 + 70/280 = 168 + 70/280 = 238/280 - 238/280 simplified gives 17/20
- So, 42/70 + 10/40 = 17/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/70+10/40 42/70+20/40 42/70+10/80 42/70+30/40 42/70+50/40 42/70+70/40