In this section we learn how to express one number as a percentage of annother. For example, by the end of this section we'll have no trouble showing that: \[18 = 45\% \ \text{of} \ 40\] We start by learning the method as well as read through a worked example before working through some exercises.
In the following tutorial we learn how to express one number as a percentage of another.
Given two numbers \(A\) and \(B\), to express \(A\) as a percentage of \(B\) we
Express \(3\) as a percentage of \(5\).
Since \(5\) is a factor of \(100\) (\(100\) is a multiple of \(5\)) we don't need a calculator. We follow our two-step method:
Express \(18\) as a percentage of \(40\).
Since \(40\) isn't a factor of \(100\) (\(100\) isn't a multiple of \(40\)) we use a calculator for step 1. With that in mind, we follow our two-step method:
Answer each of the following questions, rounding to \(1\) decimal place when appropriate.
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