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# Lesson 40 PowerPoint PPT Presentation

Lesson 40. Using Zero as a Placeholder Circle Graphs. Notes. Mental Math. Links. Activity. Proficiency. Homework. Fact Test. Mental Math. Count up and down by 3’s between 3 and 36. 4 x 75279 + 350 250 - 199\$15 + \$7.75 Double \$1.50800/40 4 x 12, ÷ 6, x 8, - 4, ÷ 6, x 3, ÷ 2.

Lesson 40

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## Lesson 40

Using Zero as a Placeholder

Circle Graphs

Notes

Mental Math

Activity

Proficiency

Homework

Fact Test

### Mental Math

• Count up and down by 3’s between 3 and 36.

• 4 x 75279 + 350

• 250 - 199\$15 + \$7.75

• Double \$1.50800/40

• 4 x 12, ÷ 6, x 8, - 4, ÷ 6, x 3, ÷ 2

• When subtracting, multiplying, and dividing

• decimal numbers, we often encounter empty

• decimal places.

• Notes

When this occurs, we will fill each empty decimal place with a zero

In order to subtract, it is sometimes necessary

to attach zeros to the top number

0.5_

-0.32

• Notes

0.2

X 0.3

_._6

draw x problem

0.5

- 0.32

### Circle Graphs

• Circle graphs, which are sometimes called pie graphs or pie charts, displays quantitative information in fractions of a circle.

### Look at example 5 on page 210

• Brett collected information from his classmates about their pets. He displayed the information about the number of pets in a circle graph.

http://www.math.com/school/subject1/lessons/S1U4L6GL.html

http://www.kidsmath.com/e_int.html

A

1 ½ + ¾ = 2 ¼

20 ¼ - 2 ¼ = 18 inches

A

1 ½ + ¾ = 2 ¼

20 ¼ - 2 ¼ = 18 inches

### Activity

A dot cube has six faces. Where two faces meet, there is an edge. How many edges does a dot cube have?

Lesson 59

Practice A-F

Complete #’s 1-10

Fact test G

5

0

:3

0

### .2 x .3 =

• .006

• .06

• .6

• 6

• None of the above

5

0

:3

0

### .4 - .32 =

• .28

• .32

• .08

• .38

• None of the above

5

0

:3

0

### .12 x .4 =

• .048

• .48

• 4.8

• 48

• None of the above

5

0

:3

0

### (.12) squared

• .24

• .144

• 1.44

• .0144

• None of the above

5

0

:3

0

### In the circle graph in example 5, what percent of the pets are cats?

• ¼

• 75%

• 25%

• ¾

• None of the above