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Decimals

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Decimals Starter Complete the assignment that was given to you at the beginning of class. You have 5 minutes to complete this assignment. K-W-L Under the column ... – PowerPoint PPT presentation

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Title: Decimals


1
Decimals
2
Starter
  • Complete the assignment that was given to you at
    the beginning of class. You have 5 minutes to
    complete this assignment.

3
K-W-L
  • Under the column labeled K tell me what you
    know about decimals.

4
K-W-L
  • Under the column labeled W tell me what you
    want to know about decimals.

5
Worlds Longest Subway Systems
City Length (km)
London 4.15
Moscow 3.4
New York City 3.71
Seoul 2.78
Tokyo 2.81
6
Comparing Decimals
  • Comparing decimals is similar to comparing whole
    numbers. You use the symbols gt or lt to write an
    inequality. An inequality is a mathematical
    sentence indicating that two quantities are not
    equal.

7
  • Example 1
  • Use lt or gt to compare Tokyos subway length
    with Seouls.

City Length (km)
London 4.15
Moscow 3.4
New York City 3.71
Seoul 2.78
Tokyo 2.81
8
  • Use the place value.
  • Tokyo 2.81
  • Seoul 2.78

First, line up the decimal points.
Then, starting at the left, find the first place
the digits differ. Compare the digits.
Since 8gt7, 2.81 gt 2.78. Tokyo has a longer
subway than Seoul.
9
  • Check your progress
  • Compare New York Citys subway length with
    Moscows.

City Length (km)
London 4.15
Moscow 3.4
New York City 3.71
Seoul 2.78
Tokyo 2.81
10
Ordering Decimals
  • Decimals that name the same number are called
    equivalent decimals. Examples are 0.8 and 0.80.
  • When you annex, or place zeros to the right of
    the last digit in a decimal, the value does not
    change. Annexing zeros is useful when ordering a
    group of decimals.
  • Example 1
  • Order 15, 14.95, 15.8, and 15.01 from least to
    greatest.
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