Add 7/42 and 10/40
7/42 + 10/40 is 5/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 42 × 20 = 840,
7/42 = 7 × 20/42 × 20 = 140/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
10/40 = 10 × 21/40 × 21 = 210/840 - Add the two like fractions:
140/840 + 210/840 = 140 + 210/840 = 350/840 - 350/840 simplified gives 5/12
- So, 7/42 + 10/40 = 5/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/42+10/40 7/42+20/40 7/84+10/40 7/42+10/80 21/42+10/40 7/42+30/40 35/42+10/40 7/42+50/40 49/42+10/40 7/42+70/40