Add 10/42 and 30/80
10/42 + 30/80 is 103/168.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 42 × 40 = 1680,
10/42 = 10 × 40/42 × 40 = 400/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
30/80 = 30 × 21/80 × 21 = 630/1680 - Add the two like fractions:
400/1680 + 630/1680 = 400 + 630/1680 = 1030/1680 - 1030/1680 simplified gives 103/168
- So, 10/42 + 30/80 = 103/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/42+30/80 10/42+60/80 10/84+30/80 30/42+30/80 10/42+90/80 50/42+30/80 70/42+30/80