Add 7/21 and 36/40
7/21 + 36/40 is 37/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
7/21 = 7 × 40/21 × 40 = 280/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
36/40 = 36 × 21/40 × 21 = 756/840 - Add the two like fractions:
280/840 + 756/840 = 280 + 756/840 = 1036/840 - 1036/840 simplified gives 37/30
- So, 7/21 + 36/40 = 37/30
In mixed form: 17/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+36/40 7/21+72/40 7/42+36/40 7/21+36/80 7/63+36/40 35/21+36/40 49/21+36/40