Dizzying Decimals

What is a decimal?

A decimal is a fractional number and is indicated by digits after a period

which is called a decimal point.

Place Values of Decimals

Decimal numbers, such as O.6495, have four digits

after the decimal point.  Each digit is

a different place value.  

Okay… • The first digit after the decimal point is

called the tenths place value. There are six tenths in the number O.6495.

• The second digit tells you how many hundredths there are in the number.  The number O.6495 has four hundredths. 

• The third digit is the thousandths place.  • The fourth digit is the ten thousandths

place which is five.• Therefore, there are six tenths, four

hundredths, nine thousandths, and five ten thousandths in the number 0.6495.

Tenths•Tenths have one digit after the decimal point

•The decimal 0.8 is pronounced "eight tenths" or "zero point eight"

•It is equal to the fraction 8/10.

Hundredths

•Hundredths have two digits after the decimal point.

•The decimal 0.36 is pronounced "thirty-six hundredths" or "zero point thirty-six".

•It is equal to the fraction 36/100.

Thousandths•Thousandths follow a similar

pattern. •They have three digits after the

decimal point. •The decimal 0.749 is pronounced

"seven hundred forty-nine thousandths" or "zero point seven four nine".

Ten-Thousandths

•Ten thousandths have four digits after the decimal point.

Zeros in the Decimal

•There may be zeros after the decimal point.

•The decimal 0.064 is pronounced "sixty-four thousandths" or "zero point zero six four".

So we’ve looked at:

• .0025

• Twenty-five ten- thousandths

•Standard Form

•Word Form

What all will we do with decimals?

LOTS!!•Read•Write•Compare•Order•Round•Add•Subtract

• Multiply• Divide• Word Problems• Change into

fractions• Change into

percents• Use with money

problems.

WOO HOO!!

Let’s get started!!