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Question

Which of the following fractions is not in its lowest form?

A
75
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B
1520
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C
1333
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D
2728
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Solution

The correct option is B 1520
We know that a fraction is in its lowest form if the HCF of its numerator and denominator is 1.
  • Consider 75.
HCF of 7 and 5 is 1. The fraction cannot be simplified further. So, it is in its lowest form.
  • Consider 1520.
HCF of 15 and 20 is 5. The fraction
can be simplified further as
15÷520÷5=34
So, it is not in its lowest form.
  • Consider 1333.
HCF of 13 and 33 is 1. The fraction cannot be simplified further. So, it is in its lowest form.
  • Consider 2728.
HCF of 27 and 28 is 1. The fraction cannot be simplified further. So, it is in its lowest form.

Hence, 1520 is not in its lowest form.

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