Today we will add with decimals.

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# Today we will add with decimals. - PowerPoint PPT Presentation

Today we will add with decimals. Add=to put together Decimals=numbers less than zero. If you buy a pencil for \$0.50 and an eraser for \$0.40, how much money will you spend?. Pencil= \$0.50 Eraser= \$0.40 \$0.50+\$0.40= \$0.90. Add. Add means to put together. Example: 2+2= 4 or . +. =.

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Presentation Transcript

### Today we will add with decimals.

Decimals=numbers less than zero

If you buy a pencil for \$0.50 and an eraser for \$0.40, how much money will you spend?

• Pencil= \$0.50
• Eraser= \$0.40

\$0.50+\$0.40= \$0.90

• Add means to put together.

Example: 2+2= 4

or

+

=

Decimal
• A decimal is a number less than 1.

For example

• 0.70
• \$0.50
• \$2.50
Importance
• When you go to Food for Less and you want to buy things, you need to be able to add the cost for items up in your head to make sure that you have enough money with you to buy them.
• When you pay for something with cash, you need to know if the person gives you the correct amount of change back.
• What would be other reasons to know how to add numbers with decimals?
Let’s try one!

3.58+ 7.41=

1

3.58

+7.41

To find the sum, rewrite numbers so that the decimal point lines up vertically.

1

0

9

9

.

Bring decimal straight down!

Let’s try one!

39.67+ 21.46=

1

39.67

+21.46

To find the sum, rewrite numbers so that the decimal point lines up vertically.

6

.

0

0

3

Bring decimal straight down!

Let’s try one!

0.681+ 8.513=

1

0 .681

+8.513

To find the sum, rewrite numbers so that the decimal point lines up vertically.

4

9

1

9

.

Bring decimal straight down!

Another way!!

To find the sum, rewrite numbers so that the decimal point lines up vertically.

213 + 4.2 + 0.635 + 13.54

4.2

213

0.635

13.54

.

1

1

000

.

.

.

00

+

0

7

5

2

3

1

3

.

If the decimal is out of sight, then the decimal is at the right.

Add zeros behind the decimal if needed.

8.02+83.48=

1

1

1

To find the sum, rewrite numbers so that the decimal point lines up vertically.

Bring decimal straight down

83. 48

+ 8. 02

.

9

2

5

0

1

1

To find the sum, rewrite numbers so that the decimal point lines up vertically.

Bring decimal straight down

49. 55

+ 29. 632

79. 18 2

1

1

1

To find the sum, rewrite numbers so that the decimal point lines up vertically.

Bring decimal straight down

94. 698

+ 33. 79

12 8. 4 8 8

Let’s review!

To put together.

• What is a decimal?

A number less than 1.

• Let’s do one more together.

44.04

+ 21.05

65.09