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You can be sure only if it is not a top heavy fraction.

For example, 12/3 has a composite numerator and a prime denominator. But its simplest from is 4.

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Not necessarily.

Q: When having a fraction the composite number the numerator and a prime number the denominator is it simplest form?

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For a fraction to be in its simplest form, numerator and denominator must have no common factor.

Any fraction is in simplest form when its numerator and denominator have a GCF of 1.

If the numerator and denominator of a fraction have a common factor (except for '1'), divide both numerator and denominator by their common factor. The fraction is in the simplest form when the numerator and denominator have no common factors.

If the GCF of the numerator and denominator is 1, the fraction is in its simplest form.

A fraction is in its simplest form when the HCF of its numerator and denominator is 1

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A fraction is in its simplest form when the GCF of the numerator and the denominator is 1.

Yes. When the numerator and denominator have a GCF of 1, the fraction is in the simplest form. To simplify, find the GCF and divide both numerator and denominator by the same: Example: simplify 30/40 30/40 divided by 10/10 (1) = 3/4

For a fraction to be in its simplest form, numerator and denominator must have no common factor.

When the GCF of the numerator and the denominator is 1, the fraction is written in its simplest form.

Numerator = 941941 Denominator = 1000000.

Any fraction is in simplest form when its numerator and denominator have a GCF of 1.

When a the GCF of the numerator and denominator of a fraction is 1, the fraction is in its simplest form.

If the numerator and denominator of a fraction have a common factor (except for '1'), divide both numerator and denominator by their common factor. The fraction is in the simplest form when the numerator and denominator have no common factors.

If the numerator and denominator are prime numbers and not equal then they don't have common factors (except 1 which would be a common factor even if the numerator and denominator were prime numbers).

A fraction where the numerator and denominator have a GCF of 1 is said to be in its simplest form.

The fraction is in its simplest form.

You put a fraction in simplest form by dividing the numerator and denominator by their greatest common factor. If the either the numerator or denominator is a prime number, the fraction cannot be simplified.