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EnchantedLearning.com Fractions 
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Reducing Fractions to Lowest Terms, Equivalent Fractions 
To reduce a fraction to lowest terms (also called its simplest form), divide both the numerator and denominator by the GCD. For example, 2/3 is in lowest form, but 4/6 is not in lowest form (the GCD of 4 and 6 is 2) and 4/6 can be expressed as 2/3.
You can do this because the value of a fraction is not changed if both the numerator and denominator are multiplied or divided by the same number (other than zero).
Worksheets and Games to Print:
Printable Set of Fraction Dominoes Print a set of fractions dominoes; each tile has fractions on it (1/2, 1/3, 1/4, 1/5, 1/6, 2/3, and 3/4) in words, in reduced form, as equivalent fractions, and in pictures. In this game the student matches fractions in different forms. 
Shade and Reduce Fractions of Figures Shade or color the portion of each figure to represent the fraction. Then finish writing the fraction in reduced terms. Worksheet #1  Go to the answers. Worksheet #2  Go to the answers.

Writing Fractions and Reducing to Lowest Terms For each geometric figure, write the fraction of each figure that is dark. Then express the fraction in lowest terms. Worksheet #1  Go to the answers. Worksheet #2  Go to the answers. Worksheet #3  Go to the answers.

Reducing Fractions to Lowest Terms Each worksheet has 15 fractions to reduce to lowest terms (also called expressing in lowest terms). To reduce a fraction to lowest terms, divide both the numerator and denominator by the Greatest Common Divisor (GCD) (also called the Greatest Common Factor (GCF)). Worksheet #1  Go to the answers. Worksheet #2  Go to the answers. Worksheet #3  Go to the answers.

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