AC Lim's answer to Laraine's Primary 5 Maths Whole Numbers Singapore question.
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Assumption method
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20 questions
Correct answer = 5 marks
Wrong answer = -1 mark
Assumed all answer correctly = 20 x 5 = 100 marks
Shortfall = 100 - 70 = 30 marks
Different between correct and wrong answer = 5 + 1 = 6 marks
Answer wrong question = 30/6 = 5 questions.
Hope this helps.
———————————
20 questions
Correct answer = 5 marks
Wrong answer = -1 mark
Assumed all answer correctly = 20 x 5 = 100 marks
Shortfall = 100 - 70 = 30 marks
Different between correct and wrong answer = 5 + 1 = 6 marks
Answer wrong question = 30/6 = 5 questions.
Hope this helps.
Date Posted:
4 years ago
Yes,yes! This is what we are taught in school. Thank you
u shld give this an upvote :)
I gave him an upvote :)
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