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Final: The Last Spin

Part of the Expressions & Data section of Coddy's Pre-Algebra journey. Lesson 51 of 51.

A spinner has three colours, and the chances of two of them are given. Every spin lands on exactly one colour, and that fact is enough to find the third chance. The answer is a fraction in lowest terms.

Challenge

A spinner lands on red with probability $\frac{3}{10}$ and on blue with probability $\frac{1}{5}$ . Otherwise it lands on green. Find the probability p of green, as a fraction in lowest terms.

This is the last problem of Pre-Algebra. The next step is Algebra, where a letter like p becomes an unknown that you solve for.

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Expressions & Data

1Variables and Expressions

What a Variable Is Writing Expressions Substituting a Value Expressions from Stories Recap: Expressions

4Combining Like Terms

Like Terms Letters and Numbers Negative Terms Two Letters Distribute, Then Collect Recap: Like Terms

7Probability

Chance as a Fraction The Complement Chance as a Percent Expected Count Recap: Probability

10Final Challenges

Final: Two Brackets Final: A Cubic Expression Final: The Phone Plan Final: A Decimal MeanFinal: The Last Spin

2Evaluating Expressions

Negative Inputs Powers in Expressions Formulas Recap: Evaluating

5Patterns and Sequences

Continuing a Pattern The Common Difference The nth Term Writing the Rule Recap: Sequences

8Tables and Charts

Reading a Table Totals and Differences Reading a Line Graph Percent of a Total Recap: Tables and Charts

3The Distributive Property

Number Properties Mental Math Distributing Letters Distributing a Minus Recap: Distributing

6Data and Averages

The Mean Mean with Negatives The Median The Mode The Range Recap: Data and Averages

9Perimeter and Area

Perimeter Area of a Rectangle Area of a Triangle Perimeter as an Expression Recap: Perimeter and Area