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## To find the simplest form of a fraction, you need to simplify the numerator and denominator by dividing them both by their greatest common divisor (GCD).

In this case, the numerator is 4 and the denominator is 90. To find the GCD of 4 and 90, you can list the factors of each number:

Factors of 4: 1, 2, 4

Factors of 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90

The greatest common divisor is the largest number that appears in both factor lists, which in this case is 2. To simplify the fraction, divide both the numerator and denominator by the GCD:

4 Ã· 2 = 2

90 Ã· 2 = 45

So, the simplified form of 4/90 is 2/45.

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