Decimals

1
Decimals

• Lets Get To The Point!

2
Decimals

• Decimals are based on a whole being split into
  ten equal parts one or more times.
• Decimals are numbers that are expressed using a
  decimal point.
• The U.S. monetary system is based on the decimal
  system.

3
Wait a second

• The U.S. monetary system is based on the decimal
  system.
• That means
• If I know money,
• I already know decimals!

4
How much does a soda cost?
5
How much does a soda cost?

• 5 Dimes
• 50 Pennies
• 50 Cents
• .50 (Hey, thats a decimal!)

6
What does Fifty-Cent look like?
7
What does Fifty-Cent look like?

• Not Quite
• Wrong guy and wrong thing to define.
• I want to know what .50 looks like.

8
What does .50 look like?
50 Pennies, .50, 50/100
5 Dimes, .5, 5/10,
9
What does .47 look like?
47 Pennies, .47, 47/100
OopsNot quite 5 dimes
10
What does .82 look like?
82 Pennies, .82, 82/100
A little more than 8 dimes
11
Learning Place Values

• We can extend the whole number place value chart
  to include decimal values.
• The decimal point is read as and.
• The place right after the decimal point is in the
  tenths spot, then hundredths, then thousands

12
98.7654

• 9 is in the tens place
• 8 is in the

13
98.7654

• 9 is in the tens place
• 8 is in the ones place
• Decimal
• 7 is in the

14
98.7654

• 9 is in the tens place
• 8 is in the ones place
• Decimal
• 7 is in the tenths place
• 6 is in the

15
98.7654

• 9 is in the tens place
• 8 is in the ones place
• Decimal
• 7 is in the tenths place
• 6 is in the hundredths place
• 5 is in the

16
98.7654

• 9 is in the tens place
• 8 is in the ones place
• Decimal
• 7 is in the tenths place
• 6 is in the hundredths place
• 5 is in the thousandths place
• 4 is in the

17
98.7654

• 9 is in the tens place
• 8 is in the ones place
• Decimal
• 7 is in the tenths place
• 6 is in the hundredths place
• 5 is in the thousandths place
• 4 is in the ten-thousands place

18
How would I say 67.34?
19
How would I say 67.34?

• Sixty-seven

20
How would I say 67.34?

• Sixty-seven AND

21
How would I say 67.34?

• Sixty-seven AND thirty-four

22
How would I say 67.34?

• Sixty-seven AND thirty-four hundredths

23
How would I say 213.972?
24
How would I say 213.972?

• Two hundred thirteen

25
How would I say 213.972?

• Two hundred thirteen AND

26
How would I say 213.972?

• Two hundred thirteen AND nine hundred seventy-two

27
How would I say 213.972?

• Two hundred thirteen AND nine hundred seventy-two
  thousandths

28
How would I say 98.7654?
29
How would I say 98.7654?

• Ninety Eight

30
How would I say 98.7654?

• Ninety Eight AND

31
How would I say 98.7654?

• Ninety Eight AND seven thousand six hundred
  fifty-four

32
How would I say 98.7654?

• Ninety Eight AND seven thousand six hundred
  fifty-four ten-thousandths

33
What have I learned today?

• What is a decimal?
• Decimal Place Values
• Read Decimals

34
You are now a Decimal Champion!
35
Now the Good PartApplying what you have learned.

• Pages 60-61
• Numbers 1-18