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## Number Sense

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**Number Sense**By: Student 1**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*****Adding & Subtracting**• Adding and Subtracting • Examples: 10 25 +9- 7 19 18 5+17= 23 10-3 = 7**Comparing Numbers**• The number line is used to show the value of different numbers. • 4 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,_,8,10 5,_,_20,25 1,3,7,_,10 10,_,30,40,50**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**Greater than and Less than**• Numbers have different values • Some have greater valuesthan others and some are less in value than others • For example: Greater than symbol: > Less than symbol: < Equal to: =**Greater & Less than examples**• Examples: 5>2 7<19 15=15 17<25 100<101 26=26 54>24 Is it true? 19<20 48=84 13>33 75>33**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: 596 52 1,925 321 38 5,421**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: 46 1,856 89 6,833 652**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!!**Works Cited**“Alabama Learning Exchange” by Alabama Department of Education, http://alex.state.al.us/standardAll.php?grade3&subject=Ma&summary=2