Fractions

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Fractions

  1. 1. Learning Objectives In the starter activity • Pupils should be able to revise what they have in previous lessons By the end of this lesson • Pupils should be able to able to add, subtract, multiply and divide fractions • They will be able to complete related questions from their text books
  2. 2. STARTERSTARTER Give a fraction equivalent toGive a fraction equivalent to 7 6
  3. 3. Simplify 27 15
  4. 4. Write as a percentage 100 87
  5. 5. Write as a fraction 7%
  6. 6. Convert it into a mixed number 7 25
  7. 7. Convert it into an improper fraction 5 3 6
  8. 8. Adding Fractions + 4 1 4 2 = 4 3
  9. 9. Why Not ??????????? 4 1 4 2 + 8 3 =
  10. 10. Remember When you add fractions The denominators must be the same
  11. 11. • Complete Exercise 15:7 • Q 1-5 • Page 352 • Time allotted: 2 minutes Pupils should be able to:
  12. 12. What Happens if • The two bottom numbers are different 6 1 3 2 +
  13. 13. 6 1 3 2 + 2 × ×2 6 1 6 4 += 6 5 =
  14. 14. • Complete Exercise 15:7 • Q 6-11 • Page 352 • Time allotted: 5 minutes Pupils should be able to:
  15. 15. 4 1 3 1 +
  16. 16. Find LCM (Lowest Common Multiple) 4 1 3 1 + Multiples of 3 and 4 Multiples of 3 3,6,9,12,15,18,21,…….. Multiples of 4 4,8,12,16,20,24,…………
  17. 17. 4 1 3 1 + Change the denominators into 12 4 3 3 4 1 3 1 +× × 4 × × = 12 3 12 4 + 12 34+ = = 1 12 12 =
  18. 18. Subtracting Fractions 7 2 7 5 − = 7 3
  19. 19. Different Denominators 3 1 12 5 −
  20. 20. 3 1 12 5 − × × 4 4 12 4 12 5 −= 12 45− =
  21. 21. • Complete Exercise 15:8 • Q 2, 4, 5, 8 • Page 352 • Time allotted: 5 minutes Pupils should be able to:
  22. 22. Multiplying Fractions 3 1 6 1 1 of the 3 parts is Green of the box is Green The box is split in half This split the green part in half. Now only of the whole box is green 3 1 6 1
  23. 23. 2 1 3 1 This means that of is 6 1
  24. 24. OR 2 1 3 1 6 1 × =
  25. 25. Question 5 9 5 218 210 18 10 3 2 6 5 = ÷ ÷ ==×
  26. 26. 2 7 4 × × 7 4 2 = 1 = 7 8
  27. 27. • Complete Exercise 15:9 • Q 1-9 • Page 353 • Time allotted: 10 minutes Pupils should be able to:
  28. 28. Dividing Fractions 8 5 4 3 ÷
  29. 29. Method • Invert the second fraction and them multiply 8 5 4 3 ÷ = 4 3 5 8 × = 5 6 20 24 = 5 1 1=
  30. 30. • Complete Exercise 15:10 • Questions as many as they can • Page 353 • Time allotted: 10 minutes Pupils should be able to:

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