Section 3.1
Transcript of Section 3.1
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Learning Target:Students will learn how to read
and write decimals.
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You owed me $1
-What if you only had dollars. How many would you give me to equal $1?
-What if you only had dimes. How many would you give me to equal $1?
-What if you only had pennies. How many would you give me to equal $1?
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You would give me:1 dollar = $1
10 dimes = $1100 pennies = $1
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Comparison between money and place values
1 Dollar (1.00) = 1 one1 Dime (0.10) = 1 tenths
1 Penny ( 0.01) = 1 hundredths
(nickel = 0.05, quarter = 0.25)
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Copy and complete the statement.( use the idea of money)
500 hundredths = ____ tenths
4 ones and 9 tenths = ____ tenths
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Copy and complete the statement.Answers:
500 hundredths = 50 tenths
4 ones and 9 tenths = 49 tenths
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A decimal is a number that is written using the base-ten place-
value system. Each place value is ten times the
place value to its right.
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Place value chart in text book on pg. 120.
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Writing Decimals:Word form to decimal form
Reading Decimals:Decimal form to words form
Expanded Form:Braking down decimals into parts
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Write twenty-five and seven hundred-thousandths as a decimal.
( “and” indicates the decimal point)
___ ___ . ___ ___ ___ ___ ___
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I put my place values done first
___ ___ . ___ ___ ___ ___ ___
Then fill in the numbers
_2_ _5_ . _0_ _0_ _0_ _0_ _7_
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Write thirty and fifteen hundredths as a decimal.
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___ ___ . ___ ___
_3_ _0_ . _1_ _5_
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Write 5.029 in words.
( You read a decimal according to the last place value.)
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5.029 What’s the last place value?
Thousandths
Five and twenty-nine thousandths
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Write 76.25 in words.
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Seventy-six and twenty-five hundredths
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Expanded Form:
5.392 = 5.0 + 0.3 + 0.09 + 0.002
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Copy and complete the expanded form of the decimal.
0.1472 = 0.1 + 0.04 + ___ + ___
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Answer:
0.1472 = 0.1 + 0.04 + _0.007_ + _0.0002_
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Can you read and write decimals?