I am not going to just tell you the answer right away but I am going to explane it first.
Problem
30x3/4
first you have to put 3/4 into a decimal. To do that you divide the numerator (top number,) by the denominator. (Bottom number.) That equals 0.75
Now all you have to do is multiply 30 by 0.75. For your answer you should get 22.5
thirty times three fourth equals twenty two and five tenths
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Three fourths times two is one and a half so if you add three fourths to that you will get two and one fourth.
11.25
Three eighths. Simple multiplication.
22.5
It is seven fourths which is one and three fourths as a mixed number.