Lesson 14Lesson 14Lesson 14Lesson 14The Number Line:The Number Line:Negative NumbersNegative Numbers

Notes Mental Math

Links

HomeworkProficiency

Activity

Practice

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?

• Notes

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

Positive numbers- the points to the right of zero

Negative numbers- points to the left of zero

Integers- Positive & negative numbers and 0

• Example #1Arrange these numbers in order from least to

greatest0, 1, -2

Next

Example #2Compare: -3 -4

-2 0 1

• Example #3– Subtract 5 from 2

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

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

What number is 7 less than 3?

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

Compare: -8 -6

1 2 3 4 5

65%

35%

0%0%0%

1. <2. >3. =4. None of the

above5. All of the above

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24

What number is opposite of 3?

1 2 3 4 5

0% 0% 0%0%

100%

1. 02. 63. -34. -65. None of the

above

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24

What number is 5 less than 0?

1 2 3 4 5

100%

0% 0%0%0%

1. -52. 53. 04. 155. None of the

above

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

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5 – 8 =

1 2 3 4 5

0%6%

0%

94%

0%

1. 132. 33. 404. -35. None of the

above

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24

All 5 numbers below are integers.

True or False? -3, 0, 2, -10, 50

1 2

65%

35%

1. True2. False

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24

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

indicate that number

1 2 3 4 5

6%0% 0%

88%

6%

1. 1862. 03. 3744. -1865. None of the

above

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24

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

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

Select level 4

The Answer is… A

N – 36 = 12 - 3

The Answer is… A

Change each fraction to a decimal, the compare.A 3/8 = .375; .38; 2/5= .4; 4/9 = .44; .49B .38; 2/5 = .4; 3/8 = .375 (stop)C .38; .49; 3/8 = .375 (stop)D .49; .44 (stop)

ActivityA dot cube has six faces. Where two

faces meet, there is an edge. How many edges does a dot cube have?

Lesson 14

Practice A-LComplete #’s 1-30