Lesson # 7 Decimals written as money ! When doing operations with decimals… Think about MONEY !

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Presentation transcript:

Lesson # 7 Decimals written as money !

When doing operations with decimals… Think about MONEY !

How much money is $0.05 a)5 cents b)5 dollars c)Half a cent d)Or half a dollar ?

If you said… $0.05 is …half a dollar…or half a cent…or 5 bucks……then…

I’m sorry… You are W R O N G !!!!!!!!!!

$0.05 is equal to 5 cents.

Another example… $0.025 is equal to… A) A quarter B)Two and a half cents C)Twenty five cents D)Two dollars and fifty cents.

If you said that $0.025 is equal to B) Two and a half cents, then you are right!

So… When adding, subtracting, multiplying or dividing … Numbers with DECIMALS….

Think about… Cash MONEY

An example of adding… $ = ?

$0.015 = one and a half cents Soooooooooo

equals… One and a half cents PLUS one and a half cents… ( 0.03) Three Cents !

An example of subtracting… $1.25 – $0.05 = ?

Think… $1.25 equals one dollar and twenty five cents… Subtract… $0.05 (a nickel) Therefore $ $0.05 = $1.2 (One dollar and twenty cents)

An example of Multiplying… 0.12 x 2.0 = ?

Convert the “friendliest” number into groups and the other to MONEY!

0.12 x 2.0 Make the 0.12 the money (12 cents) Make the 2.0 the number of groups

That means you have … Two groups of 12 cents… Which is 24 cents ( 0.24) !

An example of dividing… $0.35 ÷ 0.05 = ?

Think… 0.35 (35 cents) ÷ 0.05(5 cents)

How many times would… Five cents fit into 35 cents?

Seven ? Right !

Lets get ready for 12 practice questions ! That’s right “ 12 ”, 3 add, 3 subtract, 3 multiply and 3 divide.

Question # = ?

Question # – 0.2 = ?

Question # x 3.0 = ?

Question # ÷ 0.05 = ?

Question # = ?

Question # – 0.75 = ?

Question # x 5.0 =

Question # ÷ 0.25 = ?

Question # = ?

Question # – 0.03 = ?

Question # x 0.01 = ?

Question # ÷ 0.25 = ?

And now the answers… Get Ready!

Question # = 0.11

Question # – 0.2 = 0.05

Question # x 3.0 = 1.5

Question # ÷ 0.05 = 7

Question # = 4.95

Question # – 0.75 = 0.75

Question # x 5.0 = 0.4

Question # ÷ 0.25 = 5

Question # = 0.275

Question # – 0.03 = 1.07

Question # x 0.01 = 0.25

Question # ÷ 0.25 = 9

The END !