2. 8-6 Subtracting Fractions:
Unlike Denominators
Number Sense 2.3

4. 2 1
-
3 4

5. 2
3
1
- 4

6. 2 STEP ONE: Find the LCD
The LCD is the LCM of the
denominators.
3
1
- 4

7. 2 STEP ONE: Find the LCD
The LCD is the LCM of the
denominators.
3 3: 3, 6, 9, 12, 15
1
4: 4, 8, 12, 16, 20
- 4

8. 2 STEP ONE: Find the LCD
The LCD is the LCM of the
denominators.
3 3: 3, 6, 9, 12, 15
1
4: 4, 8, 12, 16, 20
LCM (LCD) = 12
- 4

9. 2 STEP ONE: Find the LCD
The LCD is the LCM of the
denominators.
3 3: 3, 6, 9, 12, 15
1
4: 4, 8, 12, 16, 20
LCM (LCD) = 12
- 4 STEP TWO: Write equivalent
fractions using the LCD

10. 2 STEP ONE: Find the LCD
=
The LCD is the LCM of the
denominators.
3 12 3: 3, 6, 9, 12, 15
1
4: 4, 8, 12, 16, 20
=
LCM (LCD) = 12
- 4 12 STEP TWO: Write equivalent
fractions using the LCD

11. 2 x4 STEP ONE: Find the LCD
=
The LCD is the LCM of the
denominators.
3 x4 12 3: 3, 6, 9, 12, 15
1 x3
4: 4, 8, 12, 16, 20
=
LCM (LCD) = 12
- 4 x3 12 STEP TWO: Write equivalent
fractions using the LCD

12. 2 8
x4 STEP ONE: Find the LCD
=
The LCD is the LCM of the
denominators.
3 x4 12 3: 3, 6, 9, 12, 15
1 x3 3
4: 4, 8, 12, 16, 20
=
LCM (LCD) = 12
- 4 x3 12 STEP TWO: Write equivalent
fractions using the LCD

13. 2 8
x4 STEP ONE: Find the LCD
=
The LCD is the LCM of the
denominators.
3 x4 12 3: 3, 6, 9, 12, 15
1 x3 3
4: 4, 8, 12, 16, 20
=
LCM (LCD) = 12
- 4 x3 12 STEP TWO: Write equivalent
fractions using the LCD
STEP THREE: Subtract.
Simplify if necessary

14. 2 8
x4 STEP ONE: Find the LCD
=
The LCD is the LCM of the
denominators.
3 x4 12 3: 3, 6, 9, 12, 15
1 x3 3
4: 4, 8, 12, 16, 20
=
LCM (LCD) = 12
- 4 x3 12 STEP TWO: Write equivalent
fractions using the LCD
5 STEP THREE: Subtract.
12
Simplify if necessary

16. 6 1
-
8 3

17. 6
8
1
- 3

18. 6 STEP ONE: Find the LCD
The LCD is the LCM of the
denominators.
8
1
- 3

19. 6 STEP ONE: Find the LCD
The LCD is the LCM of the
denominators.
8 8: 8, 16, 24, 32, 40
1
3: 3, 6, 9, 12, 15, 18, 21, 24
- 3

20. 6 STEP ONE: Find the LCD
The LCD is the LCM of the
denominators.
8 8: 8, 16, 24, 32, 40
1
3: 3, 6, 9, 12, 15, 18, 21, 24
- 3

21. 6 STEP ONE: Find the LCD
The LCD is the LCM of the
denominators.
8 8: 8, 16, 24, 32, 40
1
3: 3, 6, 9, 12, 15, 18, 21, 24
LCM (LCD) = 24
- 3

22. 6 STEP ONE: Find the LCD
The LCD is the LCM of the
denominators.
8 8: 8, 16, 24, 32, 40
1
3: 3, 6, 9, 12, 15, 18, 21, 24
LCM (LCD) = 24
- 3 STEP TWO: Write equivalent
fractions using the LCD

23. 6 STEP ONE: Find the LCD
=
The LCD is the LCM of the
denominators.
8 24 8: 8, 16, 24, 32, 40
1
3: 3, 6, 9, 12, 15, 18, 21, 24
=
LCM (LCD) = 24
- 3 24
STEP TWO: Write equivalent
fractions using the LCD

24. 6x3 STEP ONE: Find the LCD
=
The LCD is the LCM of the
denominators.
8 x324 8: 8, 16, 24, 32, 40
1 x8
3: 3, 6, 9, 12, 15, 18, 21, 24
=
LCM (LCD) = 24
- 3 x824STEP TWO: Write equivalent
fractions using the LCD

25. 6 18
x3 STEP ONE: Find the LCD
=
The LCD is the LCM of the
denominators.
8 x324 8: 8, 16, 24, 32, 40
1 x8 8
3: 3, 6, 9, 12, 15, 18, 21, 24
=
LCM (LCD) = 24
- 3 x824STEP TWO: Write equivalent
fractions using the LCD

26. 6 18
x3 STEP ONE: Find the LCD
=
The LCD is the LCM of the
denominators.
8 x324 8: 8, 16, 24, 32, 40
1 x8 8
3: 3, 6, 9, 12, 15, 18, 21, 24
=
LCM (LCD) = 24
- 3 x824STEP TWO: Write equivalent
fractions using the LCD
STEP THREE: Subtract.
Simplify if necessary

27. 6 18
x3 STEP ONE: Find the LCD
=
The LCD is the LCM of the
denominators.
8 x324 8: 8, 16, 24, 32, 40
1 x8 8
3: 3, 6, 9, 12, 15, 18, 21, 24
=
LCM (LCD) = 24
- 3 x824 STEP TWO: Write equivalent
fractions using the LCD
10 STEP THREE: Subtract.
24
Simplify if necessary

28. 10
24

29. 10
24
Simplify

30. 10
24
Simplify
STEP ONE - Find GCF of
numerator and denominator

31. 10
24
Simplify
STEP ONE - Find GCF of
numerator and denominator
10: 1,2,5,10
24: 1, 2, 3, 4, 6, 8, 12, 24

32. 10
24
Simplify
STEP ONE - Find GCF of
numerator and denominator
10: 1,2,5,10
24: 1, 2, 3, 4, 6, 8, 12, 24

33. 10
24
Simplify
STEP ONE - Find GCF of
numerator and denominator
10: 1,2,5,10
24: 1, 2, 3, 4, 6, 8, 12, 24

34. 10
24
Simplify
STEP ONE - Find GCF of
numerator and denominator
10: 1,2,5,10
24: 1, 2, 3, 4, 6, 8, 12, 24
GCF = 2

35. 10
24
Simplify
STEP ONE - Find GCF of STEP TWO - Divide
numerator and denominator numerator and
denominator by GCF
10: 1,2,5,10
24: 1, 2, 3, 4, 6, 8, 12, 24
GCF = 2

36. 10 ÷2
24
Simplify
÷2
STEP ONE - Find GCF of STEP TWO - Divide
numerator and denominator numerator and
denominator by GCF
10: 1,2,5,10
24: 1, 2, 3, 4, 6, 8, 12, 24
GCF = 2

37. 10 5 ÷2
24 ÷2 12
Simplify
STEP ONE - Find GCF of STEP TWO - Divide
numerator and denominator numerator and
denominator by GCF
10: 1,2,5,10
24: 1, 2, 3, 4, 6, 8, 12, 24
GCF = 2