Adding and SubtractingQuick and Dirty

Fractions Method!

Functional Mathematics Level 2: Add and subtract fractions- add and subtract using halves, thirds, quarters, fifths and tenths

You can add two fractions by doing three multiplications and an addition!

35

23

35

23

35

23

35

23

35

23

35

23

3 3

35

23

9

35

23

9

35

23

9 5 2

35

23

9 10

35

23

9 10

35

23

9 10

5 3

35

23

9 10

15

35

23

9 10

15

+

35

23

1915

9 10

15

+

35

23

1 415

An example that has denominators with a common factor…

56

49

56

49

56

49

5 9

56

49

45

56

49

45

56

49

45 24

56

49

45 24

56

49

45 24

54

56

49

45 24

54

+

56

49

6954

45 24

54

+

56

49

6954

56

49

11554

56

49

11554

5

56

49

11554

5

18

56

49

1 518

You had to cancel down at the end because of the common factor…

Mixed numbers?

Mixed numbers?Just convert to improper fractions and carry on…

Subtraction?

Subtraction?Just subtract the top totals instead of adding…

Your turn…

45

72

Answer on next slide…

45

72

4 310

Make up some more questions and check them with your calculator