Lesson 40

1. Lesson 40 Using Zero as a Placeholder Circle Graphs

2. Notes Mental Math Links Activity Proficiency Homework Fact Test

3. 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

4. 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

5. 0.5_ -0.32 • Notes 0.2 X 0.3 _._6 draw x problem

6. 0.5 – 0.32 0.5 - 0.32

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

8. 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.

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

11. A 1 ½ + ¾ = 2 ¼ 20 ¼ - 2 ¼ = 18 inches

13. A 1 ½ + ¾ = 2 ¼ 20 ¼ - 2 ¼ = 18 inches

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

15. Lesson 59 Practice A-F Complete #’s 1-10 Fact test G

16. 5 0 :3 0 .2 x .3 = • .006 • .06 • .6 • 6 • None of the above

17. 5 0 :3 0 .4 - .32 = • .28 • .32 • .08 • .38 • None of the above

18. 5 0 :3 0 .12 x .4 = • .048 • .48 • 4.8 • 48 • None of the above

19. 5 0 :3 0 (.12) squared • .24 • .144 • 1.44 • .0144 • None of the above

20. 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