Video:How to Multiply by 10

Transcript:How to Multiply by 10

Hi, I'm Jen D'Amore for About.com, and this video is all about how to multiply by 10.

Multiplying by the Power of 10

10 is one of the simplest powers to multiply.  

Let's start first by studying the multiplication table. Find the 10 on one side, and the number you'd like to multiply on the other side, follow that row and column until they meet to find your answer.

As you can see, 1 x 10 = 10, 2 x 10 = 20, 3 x 10 = 30 and so on….

Just Add a Zero

Hmmm. You may have also noticed that you can just add a zero. In this case that works. What you are really doing is moving the decimal once place to the right.  Even though you can not see it, every integer has a decimal point to it's right, and if it's a whole number, that would be followed by a "0".  So 2 x 10, when you move the decimal of the "2" one place to the right, you get your answer of 20!  and 3 x 10, is 30!

This works with numbers large and small. So 50 x 10, if you move the decimal one place to the right, you'll see it equals 500. And 200 x 10 is 2,000.

You can find plenty of worksheets online to practice multiplying by 10. Using clusters of objects in groups of ten are also great to practice with.

10, 20, 30, 40, 50, 60, 70, 80, 90 100.

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