To multiply 1 1/4 by 3/5, we can first convert the mixed number 1 1/4 to an improper fraction.
The improper fraction equivalent of 1 1/4 is (4 * 1 + 1) / 4 = 5/4.
Now we can multiply 5/4 by 3/5.
(5/4) * (3/5) = (5 * 3) / (4 * 5) = 15/20.
Therefore, 1 1/4 multiplied by 3/5 equals 15/20.
1 1/4 by 3/5
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