Add 7/42 and 9/40
7/42 + 9/40 is 47/120.
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,
9/40 = 9 × 21/40 × 21 = 189/840 - Add the two like fractions:
140/840 + 189/840 = 140 + 189/840 = 329/840 - 329/840 simplified gives 47/120
- So, 7/42 + 9/40 = 47/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/42+9/40 7/42+18/40 7/84+9/40 7/42+9/80 21/42+9/40 7/42+27/40 35/42+9/40 7/42+45/40 49/42+9/40 7/42+63/40