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Reading and Writing Large Numbers & Rounding Large Numbers Chapter 2 Lesson 1 and 2

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Reading and Writing Large Numbers

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Place Value Every digit of a number has a place value Every digit of a number has a place value The place value tells you how much a digit represents The place value tells you how much a digit represents 13,587 13,587 5=5005=500 3=30003=3000

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3 Ways to Write Numbers Word Form –Uses Words Word Form –Uses Words Thirty six thousand, five hundred thirteenThirty six thousand, five hundred thirteen Number-word form Number-word form 122 thousand122 thousand Standard Form Standard Form Numbers onlyNumbers only 36,51336,513 You will be asked to use all 3 ways! You will be asked to use all 3 ways!

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Try it Write the number in word form Write the number in word form 13,587,00313,587,003 Thirteen million, five hundred eighty seven thousand, threeThirteen million, five hundred eighty seven thousand, three Write in Number-Word form Write in Number-Word form 93,000,000,00093,000,000, billion93 billion Write in standard form Write in standard form five million, one hundred eight thousand, ninefive million, one hundred eight thousand, nine 5,108,0095,108,009

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Rounding Large Numbers

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Why Rounding? Working with large numbers can be inconvenient Working with large numbers can be inconvenient Can give you a close answer when the exact number is not needed Can give you a close answer when the exact number is not needed

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How do you round? You will be asked to round to a certain place value You will be asked to round to a certain place value Round 113,868 to the hundreds placeRound 113,868 to the hundreds place Box number in place value Box number in place value 113,868113,868 Look at number to the right of the box Look at number to the right of the box 113,868113,868

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113,868 If the number to the right of the box is 5 or higher, change the name If the number to the right of the box is 5 or higher, change the name Less than 5 stays the same Less than 5 stays the same All numbers to the right of the box turn to zeros All numbers to the right of the box turn to zeros 113, ,900

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What about this? Round to the given place Round to the given place 1,698,017 – ten thousand1,698,017 – ten thousand 1,700,0001,700,000 How did you get this number?How did you get this number?

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