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Decimals PowerPoint PPT Presentation

Decimals. Let’s Get To The Point!. 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. . Wait a second….

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Decimals

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Decimals

Let’s Get To The Point!

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.

Wait a second…

• The U.S. monetary system is based on the decimal system.

• That means…

If I know money,

How much does a soda cost?

• 5 Dimes

• 50 Pennies

• 50 Cents

• \$.50 (Hey, that’s a decimal!)

What does Fifty-Cent look like?

Not Quite…

Wrong guy and wrong thing to define.

I want to know what \$.50 looks like.

What does \$.50 look like?

50 Pennies, .50, 50/100

5 Dimes, .5, 5/10,

What does \$.47 look like?

47 Pennies, .47, 47/100

Oops…Not quite 5 dimes

What does \$.82 look like?

82 Pennies, .82, 82/100

A little more than 8 dimes

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…

98.7654

9 is in the tens place

8 is in the

98.7654

9 is in the tens place

8 is in the ones place

Decimal

7 is in the

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

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

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

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

Sixty-seven

Sixty-seven AND

How would I say 67.34?

Sixty-seven AND thirty-four

How would I say 67.34?

Sixty-seven AND thirty-four hundredths

How would I say 213.972?

Two hundred thirteen

How would I say 213.972?

Two hundred thirteen AND

How would I say 213.972?

Two hundred thirteen AND nine hundred seventy-two

How would I say 213.972?

Two hundred thirteen AND nine hundred seventy-two thousandths

Ninety Eight

Ninety Eight AND

How would I say 98.7654?

Ninety Eight AND seven thousand six hundred fifty-four

How would I say 98.7654?

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

What have I learned today?

• What is a decimal?

• Decimal Place Values