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A paper strip is divided into 7 equal parts and 4 of those parts are coloured. What fraction of the strip is left UNCOLOURED?

Class 6FractionsFractions
  • A
  • B
  • C
  • D

Step-by-Step Solution

Uncoloured parts = 7 − 4 = 3, out of 7 equal parts in all, so is the coloured part, and wrongly compares the uncoloured parts with the coloured ones instead of with the whole strip — the denominator must always be the total number of equal parts.
Answer: C)

Key idea: Reading a fraction

A fraction a/b says: the whole is split into b equal parts, and we are talking about a of them. So 3/8 means: divide the whole into 8 equal parts, take 3 of them. The two equal parts is what makes it a fraction — three slices of an unevenly cut cake do not give you 3/8. The denominator must always be a positive whole number. The numerator can be 0, equal to the denominator (giving 1), greater than the denominator, or less than it.

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