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How to Multiply by 2

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  • 0:01 Multiplication By 2
  • 1:16 The Rule
  • 1:43 Example 1
  • 2:08 Example 2
  • 2:47 Lesson Summary
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Lesson Transcript
Instructor: Yuanxin (Amy) Yang Alcocer

Amy has a master's degree in secondary education and has taught math at a public charter high school.

Multiplication is an important skill. In this video lesson, you will learn what rule to follow when multiplying by 2. You will see that this rule can be used for any multiplication-by-2 problem.

Multiplication by 2

Multiplication is repeated addition. This is one of the basic math operations, and it's very important for you to learn how to perform multiplication. This is an operation that you will need to use all the time in your future math classes and also in everyday life. In this lesson, we will talk about multiplication, but specifically about multiplication by 2.

You can view multiplication as telling you how many groups of something you have. So, when you have multiplication of 2, you will have two groups of something. For example, 8 * 2 tells you that you have two groups of 8. To find the answer, you add your groups together. So, 8 * 2 turns into 8 + 8, which turns into 16. So, 8 * 2 is equal to 16.

In the real world, you come across your multiplication by 2 when you hear words such as 'twice' and 'double'. Your friend might tell you that he has twice the amount of money as his little brother. If his little brother has $5, then twice that is 5 * 2 = 5 + 5 = 10. So, your friend has $10.

The Rule

The rule to follow for all multiplication of 2 problems is to double the number that is being multiplied by 2 by adding the number to itself. For multiplication problems, it doesn't matter in what order your numbers appear. 8 * 2 is the same as 2 * 8. Both are the same; you double the 8 to find your answer.

Let's look at a couple of examples to see this rule in action.

Example One

What is 10 * 2?

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