ACT Math : How to add even numbers

Study concepts, example questions & explanations for ACT Math

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Example Questions

Example Question #1 : How To Add Even Numbers

Which of the following expressions is odd for any integers  and ?

Possible Answers:

All the expressions can be even for some combination of  and 

Correct answer:

Explanation:

The key here is for any integers  and , that means that no matter what you set  and  equal to you will get an odd number. An odd number is not divisible by 2, also it is an even number plus and odd number. The only expression that satisfies this is  will always be even, so will , but  is always odd so the combination gives us an odd number, always.

Example Question #2 : How To Add Even Numbers

Evaluate:  

Possible Answers:

Correct answer:

Explanation:

For this problem, align and solve by adding the ones digit , tens digit , and hundreds digit . This also means that you have to add  to the  in the thousands place to get 

Example Question #3 : How To Add Even Numbers

Find the sum of 12 and 42.

Possible Answers:

Correct answer:

Explanation:

Rewrite the question into a mathematical expression.

Add the ones digit. 

Add the tens digit.

Combine the tens digit and the ones digit. The answer is .

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