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John is working at a hair salon and building a tool kit. There are $10$ hair dryers and $2$ straighteners to choose from. How many different kits can John make that use one of each item? $\newline$ _____ kits

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Counting principle

Full solution

Q. John is working at a hair salon and building a tool kit. There are

10

hair dryers and

2

straighteners to choose from. How many different kits can John make that use one of each item?

\newline

_____ kits

Determine choices: Determine the number of choices for hair dryers and straighteners. $\newline$ John has $10$ choices of hair dryers and $2$ choices of straighteners.
Use counting principle: Use the fundamental counting principle. $\newline$ To find the total number of different kits John can make, multiply the number of choices for hair dryers by the number of choices for straighteners. $\newline$ Total number of kits $=$ Number of hair dryers $\times$ Number of straighteners $\newline$ Total number of kits $= 10 \times 2$
Perform multiplication: Perform the multiplication to find the total number of kits. $\newline$ Total number of kits = $10 \times 2 = 20$

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