ACT Math : How to divide even numbers

Study concepts, example questions & explanations for ACT Math

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Example Questions

Example Question #13 : Integers

Solve:  \(\displaystyle 80\div6\)

Possible Answers:

\(\displaystyle 12\)

\(\displaystyle 13\)

\(\displaystyle 14.5\)

\(\displaystyle \frac{40}{3}\)

\(\displaystyle 13.3\)

Correct answer:

\(\displaystyle \frac{40}{3}\)

Explanation:

This problem can be solved using common factors.  

Rewrite \(\displaystyle 80\div6\) using factors.  

\(\displaystyle \frac{80}{6}=\frac{2 \cdot 40}{2 \cdot 3} = \frac{40}{3}\)

Example Question #2 : How To Divide Even Numbers

Divide: \(\displaystyle 1028\div1004\)

Possible Answers:

\(\displaystyle 1.023\)

\(\displaystyle 7\)

\(\displaystyle \frac{257}{251}\)

\(\displaystyle \frac{267}{256}\)

\(\displaystyle \frac{6}{5}\)

Correct answer:

\(\displaystyle \frac{257}{251}\)

Explanation:

Rewrite  \(\displaystyle 1028\div1004\) by using common factors. Reduce to the simplest form.

\(\displaystyle \frac{1028}{1004}=\frac{2\cdot 514}{2\cdot 502} = \frac{2\cdot 2\cdot257}{2\cdot 2\cdot251}=\frac{257}{251}\)

Example Question #3 : How To Divide Even Numbers

Divide:  \(\displaystyle 2032\div 234\)

Possible Answers:

\(\displaystyle \frac{1016}{117}\)

\(\displaystyle 8.6\)

\(\displaystyle \frac{38}{17}\)

\(\displaystyle \frac{106}{17}\)

\(\displaystyle 8.7\)

Correct answer:

\(\displaystyle \frac{1016}{117}\)

Explanation:

Rewrite \(\displaystyle 2032\div 234\) and use common factors to simplify.

 

\(\displaystyle \frac{2032}{234}=\frac{2\cdot1016}{2\cdot 117}=\frac{1016}{117}\)

Example Question #531 : Arithmetic

Divide: \(\displaystyle 308\div 36\)

Possible Answers:

\(\displaystyle \frac{77}{9}\)

\(\displaystyle 8.5\)

\(\displaystyle 9.6\)

\(\displaystyle \frac{102}{12}\)

\(\displaystyle 8.6\)

Correct answer:

\(\displaystyle \frac{77}{9}\)

Explanation:

Rewrite \(\displaystyle 308\div 36\) by using factors.  Simplify until the answer cannot be reduced any further.

\(\displaystyle \frac{308}{36} = \frac{2\cdot 154}{2\cdot 18} = \frac{2 \cdot 2\cdot 77}{2\cdot 2\cdot 9} = \frac{77}{9}\)

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