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Ira must tick the one fraction below that CANNOT be reduced any further. Which one should she tick?

Class 6FractionsFractions
  • A
  • B
  • C
  • D

Step-by-Step Solution

A fraction is in simplest form when no whole number bigger than 1 divides both parts. (÷5) and (÷3) all reduce. Only 7 and 15 share no common factor, so is already simplest. A big numerator does not mean a fraction can be reduced.
Answer: A)

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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