Dazzling Decimals

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Dazzling Decimals

• February 17, 2011

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Dazzling Decimals

• Agenda
• Review Decimal Place Value
• Compare Decimals
• Add and Subtract Decimals

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Ground Rules

• You will follow all existing classroom
  procedures.
• When you see this icon, you you
  will write in your index
  spiral.
• When you see, Lets Go!, you will clap and say
  Calculate at the same time.
• You will not take the folder or index spiral out
  of your homeroom.
• Your index spiral and folder will become one of
  your study guides for TCAP.

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Lets Review the Place Value!
2 7 3 4 5 1 9
hundreds tens ones 4/10 tenths 5/100 hundredths Whats next? Whats next?
decimal point
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• Lets Go!

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Did You Answer Correctly?
2 7 3 4 5 1 9
hundreds tens ones 4/10 tenths 5/100 hundredths 1/1000 Thousandths 9/10,000 Ten Thousandths
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You have 3 minutes to copy.
Comparing Decimals
Numbers to the right of the decimal point are
smaller than numbers to the left.
Larger Numbers
Smaller Numbers
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Lets Investigate!
Tenths Place- Takes this ones cube and divides
it evenly 10 times. Hundredths Place- Takes this
ones cube and divides it evenly 100
times. Thousandths Place- Takes this ones cube
and divides it evenly 1000 times.
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• Which is greater
• 0.6 or 0.58 ?

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Hint One trick is to add a zero to the end of
the number so that both numbers are balanced.
Then select the higher value.

• 0.60
• 0.58
• 0.6 gt 0.58

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Which is greater 0.6 or 0.58
0.6
0.58
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Lets Investigate!Place this on the back of your
index card

• Write down these numbers.
• 1.045
• 0.0456
• 2.05
• 246
• 0.04557
• .0456

• Answer these questions
• What number is the largest?
• 246
• What number is the smallest?
• 0.04557
• What numbers are equal?
• 0.0456 .0456

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• Lets Go!

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?For Understanding

• Go to your handout and complete the comparing
  decimals questions 1-10. You will have 5 minutes.
  

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Lets Check

• Your teacher will write the correct answers on
  the board. Please check your work.
• How many of you got 100?
• How many of you got 1 wrong?
• How many of you got 2 wrong?
• How many of you got 3 or more wrong?

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You have 3 minutes to copy.
Adding and Subtracting Decimals
Step 1 Line up the decimal points of each
number.
Step 2 Line up the place values.
Step 3 Add or subtract from right to left.
Regroup/borrow when necessary.
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Place this on the back of your index card.
Line up the decimal points. 22.3 34.1
56.4
Line up the decimal points. 97.568 -
38.123 59.445
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?For Understanding

• Go to your handout and complete the Lesson
  Practice-page 14 (1-8). You will have 12 minutes.
  Please show your work on the back of the paper.

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Lets Check

• Your teacher will write the correct answers on
  the board. Please check your work.
• How many of you got 100?
• How many of you got 1 wrong?
• How many of you got 2 wrong?
• How many of you got 3 or more wrong?

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Exit Ticket

• Take out your computer.
• Log onto
• http//www.quia.com/profiles/ylewis26
• Take the Exit Ticket Quiz titled
• February 17, 2011_ Decimals Exit Ticket
• secret word dazzle
• 4. There are other activities on this Quia Web
  site to practice your decimals.