Transcript Review for purchase ticket (decimals and percents)

Decimals and Percents
Goal:
Change a percent to a decimal
Multiply decimals
Percent comes from the Latin
per centum, or “per hundred”
Consequently, a number such as
32% can be written as “32 per
hundred” or the fraction 32/100.
This fraction is equivalent to the
decimal 0.32.
Percent – is a ratio of a number
to 100.
Percent to decimal
50% = .50
50 ÷ 100 = .50
Move the decimal point
two (2) places to the
left (this divides the
number by 100)
Remember that
fractions, decimals,
and percents are
discussing parts of a
whole, not how large
the whole is.
Fractions, decimals,
and percents are part
of our world. They
show up constantly
when you least expect
them. Don’t let them
catch you off guard.
Learn to master these
numbers.
Let’s Practice
•
•
•
•
•
•
6.25%
8%
25%
7.5%
4.75%
90%
• Change each
percent to a
decimal
Multiplying Decimals
• https://www.kha
nacademy.org/m
ath/cc-sixthgrade-math/cc6th-arithmeticoperations/cc6th-multiplyingdecimals/v/multi
plying-decimals
The rules for multiplying
decimals
• 1. multiply (ignoring the decimal)
• 2. count the number of spaces to
the right of the decimals
• 3. move the decimal the same
number of spaces to the left in the
•
product (answer)
Let’s Practice
• 12.5 x 6
• 11 x 5.5
• 1.2 x 2.4
• 0.625 x 15
Now we are ready to
make a purchase!