Square numbers ending in 5
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Errors in this video:
At about the 11:42 mark, the teacher says we've got the hundreds, tens, and thousands; she should have said hundreds, tens, and ones.
Lesson Description:
Shows an easy way to square numbers ending in 5 such as 65 times 65, etc. Shows an alternate way to multiply decimals using a lattice.
More free YouTube videos by Julie Harland are organized at http://yourmathgal.com
Questions answered by this video:
- What is a short way to square numbers ending with a 5?
- What does 15^2 equal?
- What does 25^2 equal?
- What does 35^2 equal?
- What does 45^2 equal?
- What does 55^2 equal?
- What does 65^2 equal?
- What does 75^2 equal?
- What does 115^2 equal?
- What does 205^2 equal?
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Staff Review
In this lesson, the teacher shows a cool way to square numbers that have a 5 as their last digit. At the end, she explains why this method works.
