Add 80/21 and 5/4
1st number: 3 17/21, 2nd number: 1 1/4
80/21 + 5/4 is 425/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
80/21 = 80 × 4/21 × 4 = 320/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
5/4 = 5 × 21/4 × 21 = 105/84 - Add the two like fractions:
320/84 + 105/84 = 320 + 105/84 = 425/84 - So, 80/21 + 5/4 = 425/84
In mixed form: 55/84
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