Add 7/21 and 25/20
1st number: 7/21, 2nd number: 1 5/20
7/21 + 25/20 is 19/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
7/21 = 7 × 20/21 × 20 = 140/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
25/20 = 25 × 21/20 × 21 = 525/420 - Add the two like fractions:
140/420 + 525/420 = 140 + 525/420 = 665/420 - 665/420 simplified gives 19/12
- So, 7/21 + 25/20 = 19/12
In mixed form: 17/12
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