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**In this module you can study how to substitute given values into a formula.**

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The most common error made when substituting values into a formula is made when negative signs are dropped.

You must use Order of Operations rules when evaluating formulas.

**Study and practice**

- Study solving by substitution (positive numbers only)This site from cimt.plymouth.ac.uk shows you the basics of using substitution to evaluate a formula. It contains text, practice questions and an online quiz. All the examples contain positive numbers only.
- Study solving by substitution (with positive and negative numbers)This site from cimt.plymouth.ac.uk shows you the basics of using substitution to evaluate a formula. It contains text, practice questions and an online quiz. The examples contain positive and negative numbers.
- Quiz yourself on solving formulas by substitutionThis University of Sydney site offers three separate quizzes on solving formulas by substitution.

Use these search terms to find additional resources:

*evaluate formulasubstitution into formula*

- Free Math Help ForumOnline 24/7 maths assistance for all levels of maths.
- SOS Math forumOnline 24/7 maths assistance for algebra and higher.
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