Arithmetic Grade Six

Lesson Ninety-one: Fraction Pictures

Denominators

In this picture you know that the denominator is 42 because you can multiply its height (6) and its width (7), 6 x 7 = 42, to get the total number of little squares in the big box.

Here's another example:

In this picture you know that the denominator is 24 because you can multiply its height (3) by its width (8), 3 x 8 = 24, to get the total number of little squares in the big box.

We can use a verbal description of one of these pictures to figure out the fraction being represented. We can find the total number of squares in a big box by multiplying the width by the height. This product will be our denominator. The number of filled squares will be our numerator.

DESCRIPTION	TOTAL SQUARES	FRACTION
height: 7 width: 4 filled: 5	28	5/28
height: 5 width: 7 filled: 11	35	11/35
height: 8 width: 8 filled: 13	64	13/64
height: 6 width: 7 filled: 21	42	21/42

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