ACT Math Formulas (Part 1)

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Last updated 8:48 PM on 10/9/26
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8 Terms

1
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part/whole

Fraction

2
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part/whole

Percent

3
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|old-new|/old x 100%

Percent Increase or Decrease

4
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multiply by (1+r)

Increase by a percent

5
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multiply by (1-r)

Decrease by a percent

6
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A = P(1 + rt)

Simple Interest

7
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A = P(1 + r)^t

Interest Compounded Annually

8
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A=P(1+ r/n) ^nt

Interest Compounded n times per year