ACT Math vocab

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Last updated 2:41 AM on 4/21/26
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12 Terms

1
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Perimeter

Add up the side lengths of a figure all the way around

2
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Mean

Classic Average

3
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Median

Middle number (if there is an even number of values, take the average of the two

middle numbers)

4
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Mode

most frequently occurring number

5
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Difference

Subtraction

6
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Product

Multiplication

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Domain

Set of possible inputs

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Range

the difference between the highest and the lowest number in a set of outputs

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Even Number

A whole number can be divided by 2

10
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Odd Number -

A whole number that cannot be divided by 2

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Integer

A whole number (not a fraction or decimal!) that can be positive, negative or zero

12
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Prime Number -

Cannot be broken up into any other factors besides 1 and itself. (e.g. -

2,3,5,7,11,13,17, 19, etc.)