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Course: Staging content lifeboat>Unit 14

Lesson 44: Decimal place value intro

Decimal place value

Introduction to decimal place values and the value of decimal digits. Created by Sal Khan and Monterey Institute for Technology and Education.

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• Why do we need to use decimals?
• To represent non-whole numbers .
• What's the highest place value?
• It can go up to any number. There is no highest number.
• What is the power of 2?
• The power of two is like saying multiply the number by itself so say 3 is their with a little 2 on the right top side of the 3 you would do the equation 3x3

Hope this helps :-)
• what does come after decillion
• Then comes undecillion, duodecillion, tredecillion, quattuordecillion, quindecillion, sexdecillion, septdecillion, octodecillion, novemdecillion, vinghtcillion ,and centillion and so con.
• Why do we need decimals in math? It just gets in the way of everything and plus, it's just like fractions!
• Well, think about it this way. If a new toy costs \$2.99 and you pay with \$5, you would not say that the toy is \$2 and 99/100. You would say it is \$2.99. Decimals make the number the easiest to read.
• So after the decimal point you always start with the tens place?
• Yes, you are quite right. Now, that should help, right Bob?
• What does scientific notation have to do with decimals?
• what does 10to the fith power mean i dont get it?