#### What Is Dilation in Math? Definition, Examples & How-to

Read on to find easy-to-follow definitions, real-life examples, and a simple guide to dilations in math.

Oct 20, 2021

Here is a number sense trick to help you calculate multiplication using mental math.

We want to find the product of 5 x 4 x 3 x 2 x 1. Using our number sense, we want to find numbers close to ten or multiples of ten to make the multiplication easier.

Here, we can find *pairs* of numbers that will multiply to be friendly numbers, such as 5 x 2 = **10** and 4 x 3 = **12**.

Multiplying by ten is easy to compute using mental math, and anything times one is just itself.

We are left with **10 x 12 = 120**, and so

5 x 4 x 3 x 2 x 1= 120.

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