1. Number Sense By: Student 1

2. Introduction In this unit we will learn: – Adding & Subtracting Review – How to Compare Numbers – Ordering numbers from 0-9999 – Writing numbers in: Expanded Form Written Form Standard Form ***Our project will consist of us students adding and subtracting money***

3. Adding & Subtracting Adding and Subtracting Examples: 1025 +9- 7 1918 5+17= 23 10-3 = 7

4. Comparing Numbers The number line is used to show the value of different numbers. 54 3 2 1 0 -1 -2 -3 -4 -5 **Highlighted numbers are those that were placed on the number line. Which comes next in the sequence: 2,4,_,8,105,_,_20,25 1,3,7,_,1010,_,30,40,50

5. Place Value All numbers have a value. Some numbers contain more value than others. – For example: Ones place: 1 Tens place: 10 Hundreds place: 100 Thousands place: 1,000

6. Greater than and Less than Numbers have different values Some have greater values than others and some are less in value than others – For example: Greater than symbol: > Less than symbol: < Equal to: =

7. Greater & Less than examples Examples: 5>27<1915=15 17<25100<101 26=2654>24 Is it true? 19<2048=84 13>3375>33

8. Writing numbers in different forms We write numbers in different ways. –Expanded form: 100+40+3 =143 50+8 =58 1,000+300+70+5 = 1,375 Your turn: Write numbers in expanded form: 596521,925 321385,421

9. Number’s in different forms Written Form – 96 Ninety Six – 13 Thirteen – 489 Four hundred and eighty nine – 3,542 Three thousand five hundred and forty two Your turn: Write problems in written form: 461,856 896,833 652

10. Number’s in different form cont’ Standard Form – We write numbers in standard form all the time and do not even realize it. For example: 56- this is standard form 623- standard form 4,589- standard form too Pretty easy friends!!

11. Works Cited “Alabama Learning Exchange” by Alabama Department of Education, http://alex.state.al.us/standardAll.php?grade3&subject=Ma&summary=2 http://alex.state.al.us/standardAll.php?grade3&subject=Ma&summary=2