Question

Which of the following is a good way to quickly determine whether 3⁄12 and ¼ are equal?

Cross multiplication

Inverse multiplication

Reciprocal multiplication

Equal multiplication
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Answer 1

A good way to quickly determine whether 3⁄12 and ¼ are equal will be

Cross multiplication

$\frac { 3} {12 }= \frac { 1} {4 } \Leftrightarrow 3*4=12*1 \Leftrightarrow 12=12$

Answer: Cross multiplication.