1. Accuracy Counts Measure Twice Cut Once

2. From 0 to 1 is equal to 1 inch 01

3. The inch is divided into two sections. The number of sections determines the denominator. 01 2 1 Section 1Section 2

4. Each half inch section is divided into two sections making a total of four sections. Notice the line height. It’s getting smaller. Remember the number of sections determines the denominator. 01 2 1 Section 1Section 2Section 3Section 4

5. The denominator is 4 because of the 4 sections created by the new lines. 01 2 1 4 1 4 3

6. Each forth inch section is divided into two sections. Notice the line height. It’s getting smaller. The denominator is 8 because of the 8 sections created by the new lines. 01 2 1 4 1 4 3 8 1 8 3 8 5 8 7 12345678

7. Each eighth inch section is divided into two sections. Notice the line height. It’s getting smaller. The denominator is 16 because of the 16 sections created by the new lines. 01 2 1 4 1 4 3 8 1 8 3 8 5 8 7 16 1 3 5 7 9 11 16 13 16 15 12 3 4 5678910111213141516

8. 01 2 1 4 1 4 3 8 1 8 3 8 5 8 7 1 3 5 7 9 11 16 13 16 15

9. PAY CLOSE ATTENTION NOW Cover the lines up. 01

10. PAY CLOSE ATTENTION NOW NOW expose the first set of lines. HOW many sections are created? 01

11. 2 sections. That tells me the denominator 01 2

12. Count by odd numbers for the numerator. 01 2 1 Remember the 2 sections. That tells me the denominator.

13. Expose the next set of lines. The number of sections created tells me the denominator. 01 2 1 4 4

14. Count by odd numbers for the numerators. 01 2 1 4 1 4 3

15. Expose the next set of lines. The number of sections created tells me the denominator. 01 2 1 4 1 4 3 8888

16. Count by odd numbers for the numerators. 01 2 1 4 1 4 3 8 1 8 3 8 5 8 7

17. Expose the next set of lines. The number of sections created tells me the denominator. 01 2 1 4 1 4 3 8 1 8 3 8 5 8 7 16

18. Count by odd numbers for the numerators. 01 2 1 4 1 4 3 8 1 8 3 8 5 8 7 16 1 3 5 7 9 11 16 13 16 15

19. You try it. Expose the first set of lines. 01

20. What is the denominator? 01

21. The denominator is 2. Now what is the numerator? 01 2

22. The numerator is 1. It’s the first odd number. Now try the next set of lines. 01 2 1

23. The denominator will be 4. The numerators will be 1 and 3. Count by odd numbers. 01 2 1

24. The denominator will be 4. The numerators will be 1 and 3. Count by odd numbers. Now expose the next set of lines. 01 2 1 4 1 4 3

25. What will denominator be? The numerators will be? Remember, count by odd numbers. 01 2 1 4 1 4 3

26. The denominator will be 8. And the numerators will be 1,3,5 and 7. Now expose the last set of lines. 01 2 1 4 1 4 3 8 1 8 3 8 5 8 7

27. What will denominator be? The numerators will be? Remember, count by odd numbers. 01 2 1 4 1 4 3 8 1 8 3 8 5 8 7

28. The denominator will be 16? The numerators will be? 1,3,5,7,9,11,13 and 15. Remember, you count by odd numbers. 01 2 1 4 1 4 3 8 1 8 3 8 5 8 7 16 1 3 5 7 9 11 16 13 16 15

29. Why do we count by odd number? Remember math class and reducing fractions. We only have odd number in the numerators because an even number could be reduced. 01 2 1 4 1 4 3 8 1 8 3 8 5 8 7 16 1 3 5 7 9 11 16 13 16 15

30. 16 2 All the red fractions can be reduced. Do you see any patterns? 01 2 1 4 1 4 3 8 1 8 3 8 5 8 7 16 1 3 5 7 9 11 16 13 16 15 16 4 6 8 10 16 12 16 14

31. http://www.rulergame.net/ Take a few minutes and test your skills with this online game.