Do now 16 sept 2008
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Do now: 16 Sept. 2008. Take out your homework! Take out a pencil or pen! Solve: |-4| = Put these numbers in order from least to greatest: -10, -32, 3, -1, 0, 7. Our goal: today we are going to review place values and learn how to write numbers in expanded notation.

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Do now: 16 Sept. 2008

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Do now 16 sept 2008

Do now: 16 Sept. 2008

  • Take out your homework!

  • Take out a pencil or pen!

  • Solve:

    • |-4| =

    • Put these numbers in order from least to greatest: -10, -32, 3, -1, 0, 7


Do now 16 sept 2008

Our goal: today we are going to review place values and learn how to write numbers in expanded notation

  • This is important because:

    • 1. Understanding place values will appear on the NY State Math exam and Ms. Dass’ final exam in June!

    • 2. Place values are fundamental to understanding the number system!


Place values fill in

PLACE VALUES. . . (fill in!)

  • See if you can fill in this place values chart to the TRILLIONS PLACE as a class!


Let s practice identifying place values fill in

Let’s practice identifying place values. . . (fill in!)

  • Identify the place value of the underlined digit. . .

    • 1. 5,674

    • 2. 178, 352, 555, 000, 033

    • 3. 577, 003

    • 4. 145, 645, 888, 053


Let s try reading a number

Let’s try reading a number…

  • Take 15,999,000,099

  • Break the number up into mini sections by COMMAS

    • So . . . | 15| 999 | 000 | 099

      m t

      i h

      l o

      l u

      I s

      o a

      n n

      d

  • Read each section and the place value of the digit in front of the comma!

  • You never have to read zeros or the ones place! Zeros are only place holders so when you read a number you don’t say them!


Practice reading numbers

Practice reading numbers . . .

  • To help you, say only the place value of the colored digits!

    • 4. 5, 677, 035

    • 5. 16,000, 190, 546

    • 6. 143, 766, 056, 000, 001


Writing numbers

Writing numbers. . .

  • You write numbers exactly how you read them . . .

    • So read 57, 653, 062 and write it down: ________________________________________________________________________________________________________________________


Let s try a few

Let’s try a few. . .

  • Express these numbers in written form:

    • 7. 244, 043: ______________________________________________________________________

    • 8. 10, 555, 000, 037: _________________________________________________________________________________________________________


Expanded notation

Expanded Notation . . .

  • Means breaking down a number by its place values, multiplying and adding them. . .

  • Look at 46, 522:

    • we write this in expanded notation as:

      (4x10,000) + (6x1,000) + (5x100) + (2x10) + (2x1)

      which is the same as . . .

      40,000 + 6,000 + 500 + 20 + 2 =

      46, 522


Watch me

Watch me. . .

  • 14, 354 in expanded notation is . . .


Let s try a few1

Let’s try a few . . .

  • Write each number in expanded notation:

    • 9. 15, 034=

    • 10. 436, 921=

    • 11. 144, 888=


Now you try in class work

Now you try . . . (in class work!)

  • WRITE EACH NUMBER IN WRITTEN FORM AND EXPANDED NOTATION.

  • 12. 35, 998

  • 13. 143, 002

  • 14. 35, 342, 451

  • 15. 154, 425, 490

  • 16. 1,088

  • 17. 77, 892

  • 18. 5,000

  • 19. 98, 000, 193, 000

  • 20. 198, 000, 034


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