The document discusses finding the greatest common factor (GCF) of two numbers and using the GCF to write fractions in simplest form. It provides examples of finding the GCF of 18 and 27 (which is 9) and using it to write 12/18 in simplest form (which is 2/3). Similarly, it finds the GCF of 8 and 20 (which is 4) and writes 8/20 in simplest form (which is 1/5). The goal is to practice using the GCF to simplify fractions.

1. 7-8 Fractions in Simplest
Form
Number Sense 1.5

2. Review:

3. Review:
GCF - greatest common factor

4. Review:
GCF - greatest common factor
Find the GCF of 18 and 27

5. Review:
GCF - greatest common factor
Find the GCF of 18 and 27
18:

6. Review:
GCF - greatest common factor
Find the GCF of 18 and 27
18:
27:

7. Review:
GCF - greatest common factor
Find the GCF of 18 and 27
18: 1,2,3,6,9,18
27:

8. Review:
GCF - greatest common factor
Find the GCF of 18 and 27
18: 1,2,3,6,9,18
27: 1,3,9,27

9. Review:
GCF - greatest common factor
Find the GCF of 18 and 27
18: 1,2,3,6,9,18
27: 1,3,9,27

10. Review:
GCF - greatest common factor
Find the GCF of 18 and 27
18: 1,2,3,6,9,18
27: 1,3,9,27

11. Review:
GCF - greatest common factor
Find the GCF of 18 and 27
18: 1,2,3,6,9,18
27: 1,3,9,27

12. Review:
GCF - greatest common factor
Find the GCF of 18 and 27
Which is the
18: 1,2,3,6,9,18 greatest
between
27: 1,3,9,27 1,3,9 ?

13. Review:
GCF - greatest common factor
Find the GCF of 18 and 27
Which is the
18: 1,2,3,6,9,18 greatest
between
27: 1,3,9,27 1,3,9 ?
GCF is 9

14. 12
Write 18
in simplest form.

15. 12
Write 18
in simplest form.
STEP ONE: Find GCF of
12 and 18

16. 12
Write 18
in simplest form.
STEP ONE: Find GCF of
12 and 18
STEP TWO: Divide
numerator and
denominator by GCF

17. 12
Write 18
in simplest form.

18. 12
Write 18
in simplest form.
12:

19. 12
Write 18
in simplest form.
12:
18:

20. 12
Write 18
in simplest form.
12: 1,2,3,4,6,12
18:

21. 12
Write 18
in simplest form.
12: 1,2,3,4,6,12
18: 1,2,3,6,9,18

22. 12
Write 18
in simplest form.
12: 1,2,3,4,6,12
18: 1,2,3,6,9,18

23. 12
Write 18
in simplest form.
12: 1,2,3,4,6,12
18: 1,2,3,6,9,18

24. 12
Write 18
in simplest form.
12: 1,2,3,4,6,12
18: 1,2,3,6,9,18

25. 12
Write 18
in simplest form.
12: 1,2,3,4,6,12
18: 1,2,3,6,9,18

26. 12
Write 18
in simplest form.
12: 1,2,3,4,6,12
GCF = 6
18: 1,2,3,6,9,18

27. 12
Write 18
in simplest form.
12: 1,2,3,4,6,12
GCF = 6
18: 1,2,3,6,9,18
12
18

28. 12
Write 18
in simplest form.
12: 1,2,3,4,6,12
GCF = 6
18: 1,2,3,6,9,18
12 ÷
18 ÷

29. 12
Write 18
in simplest form.
12: 1,2,3,4,6,12
GCF = 6
18: 1,2,3,6,9,18
12 ÷ 6
18 ÷ 6

30. 12
Write 18
in simplest form.
12: 1,2,3,4,6,12
GCF = 6
18: 1,2,3,6,9,18
12 ÷ 6 =
18 ÷ 6 =

31. 12
Write 18
in simplest form.
12: 1,2,3,4,6,12
GCF = 6
18: 1,2,3,6,9,18
simpl
est f
or m!
12 ÷ 6 = 2
18 ÷ 6 = 3

32. 8
Write 20
in simplest form.

33. 8
Write 20
in simplest form.
8:

34. 8
Write 20
in simplest form.
8:
20:

35. 8
Write 20
in simplest form.
8: 1,2,4,8
20:

36. 8
Write 20
in simplest form.
8: 1,2,4,8
20: 1,2,4,5,10,20

37. 8
Write 20
in simplest form.
8: 1,2,4,8
20: 1,2,4,5,10,20

38. 8
Write 20
in simplest form.
8: 1,2,4,8
20: 1,2,4,5,10,20

39. 8
Write 20
in simplest form.
8: 1,2,4,8
20: 1,2,4,5,10,20

40. 8
Write 20
in simplest form.
8: 1,2,4,8
GCF = 4
20: 1,2,4,5,10,20

41. 8
Write 20
in simplest form.
8: 1,2,4,8
GCF = 4
20: 1,2,4,5,10,20
8
20

42. 8
Write 20
in simplest form.
8: 1,2,4,8
GCF = 4
20: 1,2,4,5,10,20
8 ÷
20 ÷

43. 8
Write 20
in simplest form.
8: 1,2,4,8
GCF = 4
20: 1,2,4,5,10,20
8 ÷ 4
20 ÷ 4

44. 8
Write 20
in simplest form.
8: 1,2,4,8
GCF = 4
20: 1,2,4,5,10,20
8 ÷ 4 =
20 ÷ 4 =

45. 8
Write 20
in simplest form.
8: 1,2,4,8
GCF = 4
20: 1,2,4,5,10,20
simpl
est f
or m!
8 ÷ 4 = 2
20 ÷ 4 = 5