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## PowerPoint Slideshow about 'Lesson 40' - lunea-richmond

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Mental Math

- Count up and down by 3’s between 3 and 36.
- 4 x 75 279 + 350
- 250 - 199 $15 + $7.75
- Double $1.50 800/40
- 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

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

Activity

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

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

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