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Grade 8 · Common Fractions
Adding & Subtracting Fractions
MEMORANDUM
Name: 
Class: 
Date: 
Mark
  / 18

Answer all questions. Show all your working — marks are awarded for method as well as the final answer. Teacher copy: accept any correct equivalent method.

  1. 1
    29 + 59
    (2)
    Same denominator → 79✓✓ (2)
  2. 2
    78 − 38
    (2)
    48 = 12 (simplify)✓✓ (2)
  3. 3
    12 + 14
    (2)
    LCD 4 → 24 + 14 = 34✓✓ (2)
  4. 4
    23 + 16
    (2)
    LCD 6 → 46 + 16 = 56✓✓ (2)
  5. 5
    56 − 12
    (2)
    LCD 6 → 56 − 36 = 26 = 13✓✓ (2)
  6. 6
    34 + 25
    (2)
    LCD 20 → 1520 + 820 = 2320 = 1 320✓✓ (2)
  7. 7
    112 + 214
    (2)
    32 + 94 = 64 + 94 = 154 = 334✓✓ (2)
  8. 8
    313 − 112
    (2)
    103 − 32 = 206 − 96 = 116 = 1 56✓✓ (2)
  9. 9
    A pipe is 34 m long and another is 23 m. What is their total length?
    (2)
    LCD 12 → 912 + 812 = 1712 = 1 512 m✓✓ (2)
TOTAL: 18 marks
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