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# Do now: 16 Sept. 2008 PowerPoint PPT Presentation

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.

Do now: 16 Sept. 2008

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### Do now: 16 Sept. 2008

• 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

• 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!)

• 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!)

• 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…

• 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 . . .

• 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. . .

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

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

### Let’s try a few. . .

• Express these numbers in written form:

• 7. 244, 043: ______________________________________________________________________

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

### 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. . .

• 14, 354 in expanded notation is . . .

### 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!)

• 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