Tuesday, October 6, 2015

Math 4: The Place Value Shuffle

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Yep! Today we had fun learning about place value. Now we can understand and explain the value of digits.

What's a digit?

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What's place value?


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If you're looking for a place value song to sing for the next 3 months, here you go!


Place value, place value, movin' to the left...

I can dig that groovy beat.


That leads us to the Place Value Shuffle! 
Put on your dancin' shoes!

In our decimal number system, the value of a digit depends on its place, or position, in the number. Each place has a value of 10 times the place to its right. A number in standard form is separated into groups of three digits using commas.

This chart shows the value of each digit in a large number. Each number value is 10 times greater than the number on its right.



Going the opposite direction… each digit is 1/10 of the digit on its left.




That's it! You've got it!

Here's a mini-lesson on this phenomena using base-ten blocks.





Moving on...

Next we talked about finding the value of a digit within a big number. To figure out the value you have to look at all of the numbers from right to left.  You start with the ones place and multiply by 10 for each digit to the left. A quick way to do this is to count the digits to the right of the number you are finding the value of. Then replace those digits with ZEROs.


We're finding the value of 9, so we can replace the digits to the right of 9 with 0s. The value of 9 in 196,528,347 is 90,000,000 or ninety million! Click here for a tutorial review of how to find a value of a digit.

Here is a look at this week's 4.NBT.1 notebook pages. If you click on the image, it will enlarge. A printable version can be found in k-mail. Please check your work and make sure your notebook is up to date before Tuesday, October 13.

[click to enlarge]



For more Place Value fun, check out these games!


Keep up the great work!

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