18 de febrero de 2018

Rule of three


Hello, hello!
Now that we know about direct proportionality, we're learning the rule of three in Mathematics.
The rule of three is an operation that helps us quickly solve both direct and inverse proportion word problems. In order to use the rule of three, we need three values; two that are proportional to one another, and a third. From there, we will figure out the fourth value.

Direct rule of three

We will place the 3 values (which we will call “a”, “b”, and “c”) and the unknown value that we want to figure out (“x”) in a table. Next, we will apply the following formula: 
Rule of three
Direct rule of three

Examples of rule of three
Examples of rule of three

Inverse rule of three

We will place the 3 values and the unknown value in the table, just as we did in the previous case, but we will apply a different formula:

Inverse rule of three formula
Inverse rule of three formula
Example of inverse rule of three
Example of inverse rule of three
Examples of the rule of three
Examples of the inverse rule of three
Exercises on the rule of three:

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