PSAT Math : How to subtract even numbers

Study concepts, example questions & explanations for PSAT Math

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Example Questions

Example Question #1 : How To Subtract Even Numbers

If \(\displaystyle a\) is an odd integer and \(\displaystyle b\) is an even integer, which of the following must true of \(\displaystyle a-b\)?

Possible Answers:

\(\displaystyle a-b=b-a\)

The result will be even.

We cannot draw any conclusions from the given information.

The result will be odd.

\(\displaystyle a-b=a(b-2)\)

Correct answer:

The result will be odd.

Explanation:

An even number subtracted from an odd number will always produce an odd result.

None of the other answer choices are correct.

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