Fun Pattern squaring numbers whose digits are all ones
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Lesson Summary:
This lesson explores a unique pattern for multiplying numbers by themselves (squaring) if all its digits are 1. By using the pattern, it's possible to solve complex calculations without a calculator. For example, by counting up to the number of ones and then back down to 1, you can solve any number up to 9 ones in a row. It's a fun and useful trick that can be shared with friends and family.
Lesson Description:
A fun pattern for multiplying numbers by themselves (squaring) if all its digits are 1....like 11 x 11 or 11111 x 11111, etc. Show your friends!
More free YouTube videos by Julie Harland are organized at http://yourmathgal.com
Questions answered by this video:
- What are some fun number patterns?
- What is the pattern when all ones are squared?
- What is 111^2, 11111^2, and 111111111^2?
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Staff Review
This lesson is a cute little trick for squaring numbers that have only 1s in them. The pattern is pretty cool, and it works all the way up to 111111111^2. -
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