Fractions

1. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
Adding and Subtracting
Quick and Dirty
Fractions Method!
Adult Numeracy N2/L2.4: Use fractions to add, subtract, multiply
and divide amounts or quantities
Functional Mathematics Level 2: Add and subtract fractions
- add and subtract using halves, thirds, quarters, fifths and tenths
Kindly contributed to www.skillsworkshop.org by Keith Burnett, Sutton Coldfield College.
ping.keith@googlemail.com
To see more of Keith’s resources, including a traditional approach to adding and subtracting
fractions visit
http://www.slideshare.net/keithpeter

2. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
You can add two
fractions by doing
three multiplications
and an addition!

3. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
3
5

2
3

4. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
3
5

2
3

5. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
3
5

2
3

6. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
3
5

2
3

7. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
3
5

2
3

8. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
3
5

2
3
3  3

9. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
3
5

2
3
9

10. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
3
5

2
3
9

11. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
3
5

2
3
9 5  2

12. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
3
5

2
3
9 10

13. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
3
5

2
3
9 10

14. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
3
5

2
3
9 10
5  3

15. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
3
5

2
3
9 10
15

16. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
3
5

2
3
9 10
15
+

17. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
3
5

2
3

19
15
9 10
15
+

18. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
3
5

2
3
1
4
15

19. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
An example that has
denominators with a
common factor…

20. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
5
6

4
9

21. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
5
6

4
9

22. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
5
6

4
9
5  9

23. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
5
6

4
9
45

24. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
5
6

4
9
45

25. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
5
6

4
9
45 24

26. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
5
6

4
9
45 24

27. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
5
6

4
9
45 24
54

28. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
5
6

4
9
45 24
54
+

29. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
5
6

4
9

69
54
45 24
54
+

30. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
5
6

4
9

69
54

31. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
5
6

4
9
1
15
54

32. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
5
6

4
9
1
15
54
5

33. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
5
6

4
9
1
15
54
5
18

34. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
5
6

4
9
1
5
18

35. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
You had to cancel
down at the end
because of the
common factor…

36. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
Mixed numbers?

37. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
Mixed numbers?
Just convert to
improper fractions
and carry on…

38. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
Subtraction?

39. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
Subtraction?
Just subtract the top
totals instead of
adding…

40. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
Your turn…

41. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
4
5

7
2
Answer on next slide…

42. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
4
5

7
2
 4
3
10

43. Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
Make up some more
questions and check
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calculator