If you've lost your copy of the scientific notation practice from class today, click on the image below to download a new copy. Remember that the four problems on the back are for you to TRY for homework tonight!
We finished up our work with scientific notation today, but some of you were asking for some more practice with multiplying and dividing numbers in scientific notation. Click on the image below for a few more practice problems with both multiplication and division.
***Remember: If you're trying to multiply two numbers in scientific notation, multiply the two coefficients first and then add the exponents for the base of ten. Be sure to check that your answer has a coefficient that is greater than or equal to 1 but less than 10 (if it doesn't, put the number in standard notation and then put it into CORRECT scientific notation). If you're trying to divide two numbers in scientific notation, the steps are very similar to multiplying. Divide the coefficients, and subtract the exponents on the base ten. Again, check that your final coefficient is between 1 and 10. In class, we have been working on square and cube roots and more recently, classifying numbers as either rational or irrational. Here are two skill checks you can do to check your understanding. Each skill check has four questions to answer. If you want, you can scan the QR code (that funny looking barcode on the top) to watch a video first. Then, complete the four questions. Scan the QR code on the top right to check your answers. You can download a QR code scanner app for free on your smartphone. Happy scanning!
If you're looking for some fun ways to review exponents, here is a list of websites that have games involving exponent practice.
http://www.mathgametime.com/games/otter-rush-exponents-game http://www.math-play.com/exponent-game.html (this is for those looking for a real challenge) http://www.ixl.com/math/grade-8/multiplication-with-exponents http://www.ixl.com/math/grade-8/division-with-exponents http://www.ixl.com/math/grade-8/multiplication-and-division-with-exponents http://www.ixl.com/math/grade-8/power-rule Square roots can be used to find the length of one side of a square when given the area. How are square roots and the areas of squares related? Check out this video! Remember, if it asks you to log in, click in the top right corner to indicate you are student and avoid the log in!
Our next topic will be square roots. Square roots are inverses of squares. We learned when working with exponents that squaring a number means raising it to the second power or multiplying the number times itself. To take the square root, you are asking, "what number when multiplied times itself equals this number?" Watch this video for a little introduction to square roots. Remember, if it asks you to log in, just click in the top right corner to indicate you are a student to avoid the need to log in.
The summary sheet from the previous posts shows the special properties of exponents. Here are some videos that help explain these properties. If the video link asks you to log in, just click the top right corner to indicate you are a student and bypass the log in.
In class, we investigated exponents and discovered some special properties. The document below is a summary of our findings.
Our next lesson will be on exponents. Watch this video for a quick preview on this topic. If the video has a pop up that asks you to log in, just click in the top right corner that you are a student and you can avoid the log in :)
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April 2015
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