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## PowerPoint Slideshow about ' Lesson 14' - raymond-valenzuela

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Mental Math

- Count up and down by ¼’s between ¼ and 6
- 8 x 400 360 + 230
- 6 x 3000 1250 - 1000
- $7.50 + $7.50 $10 - $7.50
- Start with 10. add 2; divide by 3; multiplied by 4; then subtract 5. What is the answer?

-8 -7 -6-5 -4 -3 -2-1 0 1 2 3 4 5 6 7 8 9

- Notes

Positive numbers- the points to the right of zero

Negative numbers- points to the left of zero

Integers- Positive & negative numbers and 0

-2 0 1

- Example #1

Arrange these numbers in order from least to greatest

0, 1, -2

Example #2

Compare: -3 -4

Next

Order matters and subtraction. Start at 2 and count to the left five integers. You should end up at - 3

- Example #3
- Subtract 5 from 2

-4-3-2 -1 0 1 2 3 4 5 6 7 8 9 10

What number is 7 less than 3?

-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7

Compare: -8 -6

- <
- >
- =
- None of the above
- All of the above

What number is opposite of 3?

- 0
- 6
- -3
- -6
- None of the above

What number is 5 less than 0?

- -5
- 5
- 0
- 15
- None of the above

5 – 8 =

- 13
- 3
- 40
- -3
- None of the above

All 5 numbers below are integers. True or False?-3, 0, 2, -10, 50

- True
- False

The desert floor was 186 feet below sea level. Use a negative number to indicate that number

- 186
- 0
- 374
- -186
- None of the above

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

Select level 4

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

The Answer is… A

Change each fraction to a decimal, the compare.

A 3/8 = .375; .38; 2/5= .4; 4/9 = .44; .49

B .38; 2/5 = .4; 3/8 = .375 (stop)

C .38; .49; 3/8 = .375 (stop)

D .49; .44 (stop)

Activity

0

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

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