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Aug04

Distributive Property in Geometry

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In today’s post, we are going to take a look at the distributive property from a geometric point of view.

You can consult these entries for more information on this property:

Distributive Property from a Geometric point of view:

We’re going to start by drawing a striped rectangle that’s divided into two smaller rectangles, one blue and another yellow.

distributive Property

First, we’re going to calculate the area of the big striped rectangle that has a base of (2+4) units and height of 3 units. 

distributive Property

Area = 3 x (2 + 4) units²

Next, we’ll calculate the areas of the two smaller rectangles separately:

distributive Property

When added together, the areas of these two smaller rectangles need to give the exact same result as the area of the big rectangle, right? Let’s check:

distributive Property

distributiveWe can observe that the areas are the same. And without knowing it, we’ve applied what we call the distributive property of multiplication. Let’s look at an example.

distributive Property

A lot of you will wonder, and the combined operations? There’s an order to do mathematical operations…

If we have 4 · (2+3), the first thing we’ve been taught to do is to calculate what is in parentheses — 2 + 3 = 5 — and after doing so, to go ahead with the multiplication 4 x 5 which brings us to the answer 20.

So then, when will we make use of the distributive property?

This property is particularly useful in algebra.

Let’s imagine that we want to solve the following equation:

5 · (x+3) = 25

Here we won’t be able to start by simplifying what is the parenthesis because we can’t add x + 3. We can, however, apply the distributive property and get:

distributive

Now all that’s left to do is to solve the equation.

distributive Property

Now it’s time to practice! 

I hope you enjoyed this explanation on the distributive property of multiplication in geometry and that it is helpful!

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