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MATHEMATICS YEAR 4 FRACTIONS NOTES (ADDING & SUBSTRACTING)
FRACTION: HOW TO ADD?? When the denominators are the same… We have a rectangle that is cut into 4 pieces... Each piece is  and 2 pieces are  If we add  , that would be… 4 4 + = 1 4 2 4 1 2 + = 3 4
When the denominators are different… We need to find least common denominator (LCD) For example,  The LCD  for 2 and 3 is 6… Change  :  Change  :
When the denominators are the same… We have a rectangle that is cut into 6 pieces... Each piece is  .  So,  HOW TO SUBTRACT?? (5 pieces) Take away 2 pieces,  So,  (3 pieces are left) 1 6 5 6 - 2 6 5 6 = 5 6 - 2 6 = 3 6
When the denominators are different… When the denominators are different…
FRACTIONS TASK : PROBLEM SOLVING  (ADDING & SUBSTRACTING) Instruction: Answer the problem solving questions and show the working steps. Students have to post their answers on teacher’s Wikispace, ‘mathsforfun’, at the discussion section.
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Mathsfraction

  • 1. MATHEMATICS YEAR 4 FRACTIONS NOTES (ADDING & SUBSTRACTING)
  • 2. FRACTION: HOW TO ADD?? When the denominators are the same… We have a rectangle that is cut into 4 pieces... Each piece is and 2 pieces are If we add , that would be… 4 4 + = 1 4 2 4 1 2 + = 3 4
  • 3. When the denominators are different… We need to find least common denominator (LCD) For example, The LCD for 2 and 3 is 6… Change : Change :
  • 4. When the denominators are the same… We have a rectangle that is cut into 6 pieces... Each piece is . So, HOW TO SUBTRACT?? (5 pieces) Take away 2 pieces, So, (3 pieces are left) 1 6 5 6 - 2 6 5 6 = 5 6 - 2 6 = 3 6
  • 5. When the denominators are different… When the denominators are different…
  • 6. FRACTIONS TASK : PROBLEM SOLVING (ADDING & SUBSTRACTING) Instruction: Answer the problem solving questions and show the working steps. Students have to post their answers on teacher’s Wikispace, ‘mathsforfun’, at the discussion section.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.