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Math Unit 1 Place Value

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Whole Numbers A whole number is a number that shows ones, tens, hundreds, thousands, ten, thousands, hundred thousands, and so on. You can write a whole number using digits, words, or drawings.

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Digits and Words 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,are the digits used to write whole numbers. The number 1,247 has four digits. 1 2 4 7 The number 1,247 is written in standard form. In word form, the number 1,247 is written one thousand, two hundred forty-seven.

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Drawings Blocks are often used to represent numbers in drawings.

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Place Value Hundred Thousands Ten Thousands ThousandsHundredsTensOnes 891247 Examples: This place-value table shows the values of the digits of 891,1247. Numbers written in expanded form show the values of the digits. 891,247 = 800,00 + 90,000 + 1,000 + 200 + 40 + 7 Examples: This place-value table shows the values of the digits of 308,041. Hundred Thousands Ten Thousands ThousandsHundredsTensOnes 308041 Notice that there are no ten thousands or hundreds. This is why a 0 (zero) is written in each of those places. Zeros are not shown in expanded form or written in word form. 308,041 = 300,00 + 8,000 + 40 + 1 308,041 = three hundred eight thousand, forty-one

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Place Value (Con’t) Commas separate groups of digits so that you can easily read large numbers. Start at the far right of the number. Work your way left. Place a comma to the left of every 3 rd digit. 923,184 start

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