Make a bar with 2 red tiles, and 3 blue tiles. A fraction is a number that names a part of a whole. The top number in a fraction is called the numerator and the bottom number is called the denominator. The denominator represents the number of equal-sized pieces in a whole unit. The numerator represents the number of pieces made by the part. So the red tiles represent the fraction 2/5 and the blue tiles represent the fraction 3/5.
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