Understanding Negative Numbers and the Number Line in Math

1. Lesson 14 The Number Line: Negative Numbers

2. Notes Mental Math Links Activity Proficiency Homework Practice

3. 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?

4. 0 -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

5. 0 -2 0 1 • Example #1 Arrange these numbers in order from least to greatest 0, 1, -2 Example #2 Compare: -3 -4 Next

6. 0 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

7. Compare: -8 -6 • < • > • = • None of the above • All of the above

8. What number is opposite of 3? • 0 • 6 • -3 • -6 • None of the above

9. What number is 5 less than 0? • -5 • 5 • 0 • 15 • None of the above

10. 5 – 8 = • 13 • 3 • 40 • -3 • None of the above

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

12. 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

13. 0 http://www.math.com/school/subject1/lessons/S1U4L6GL.html Select level 4 http://www.kidsmath.com/e_int.html

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15. 0 The Answer is… A N – 36 = 12 - 3

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17. 0 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)

18. Activity 0 A dot cube has six faces. Where two faces meet, there is an edge. How many edges does a dot cube have?

19. 0 Lesson 14 Practice A-L Complete #’s 1-30