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Lesson 1. Whole Number Place Value Reading & Writing Whole Numbers Addition. Digits & Place Value. 1 2 3 , 4 5 6 , 7 8 9 . 1 2 3 4 5. ones. tens. hundreds. hundred thousanths. thousands. ten thousandths. ten thousands. thousandths. hundred thousands. hundredths. millions. tenths.

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Lesson 1


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    1. Lesson 1 Whole Number Place Value Reading & Writing Whole Numbers Addition

    2. Digits & Place Value 1 2 3 , 4 5 6 , 7 8 9 . 1 2 3 4 5 ones tens hundreds hundred thousanths thousands ten thousandths ten thousands thousandths hundred thousands hundredths millions tenths ten millions hundred millions

    3. Example 1.1 • In the number 46,235: • what is the value of the digit 5? • what is the value of the digit 2? • what is the value of the digit 4?

    4. Reading & Writing Whole Numbers • all numbers between 20 and 100 that do not end in zero are hyphenated words when we write them out: • 23: twenty-three • 51: fifty-one

    5. Reading & Writing Whole Numbers • the word “and” is not used • 501: five hundred one not five hundred and one • 422: four hundred twenty-two not four hundred and twenty-two

    6. Example 1.2 • Use words to write this number: 51,723,642

    7. Example 1.3 • Use digits to write the number: • fifty-one billion, twenty-seven thousand, five hundred twenty

    8. Expanded Form • To write a number in expanded form: • write each of its nonzero digits multiplied by the place value of the digit • use parenthesis to enclose each of these multiplications • put a plus sign between each set of parenthesis

    9. Example 1.4 • Write the following number in standard form: (5 x 1000) + (2 x 10)

    10. Example 1.5 • Write the following number in expanded form: 6,305,126

    11. Addition • addend: each number we’re adding • sum: answer of addition problem • to add whole numbers, we line up the numbers so that the last digits are aligned vertically

    12. Example 1.6 • Add: 4 + 407 + 3526