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Lesson 1
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Transcript of Lesson 1
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
hundred millions
ten millions
millions
hundred thousands
ten thousands
thousands
hundredstens
ones
tenths
hundredths
thousandths
ten thousandthshundred thousanths
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?
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
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
Example 1.2
• Use words to write this number:
51,723,642
Example 1.3
• Use digits to write the number:
• fifty-one billion, twenty-seven thousand, five hundred twenty
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
Example 1.4
• Write the following number in standard form:
(5 x 1000) + (2 x 10)
Example 1.5
• Write the following number in expanded form:
6,305,126
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
Example 1.6
• Add: 4 + 407 + 3526