Add 45/12 and 90/20
1st number: 3 9/12, 2nd number: 4 10/20
45/12 + 90/20 is 33/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
45/12 = 45 × 5/12 × 5 = 225/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
90/20 = 90 × 3/20 × 3 = 270/60 - Add the two like fractions:
225/60 + 270/60 = 225 + 270/60 = 495/60 - 495/60 simplified gives 33/4
- So, 45/12 + 90/20 = 33/4
In mixed form: 81/4
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