Menghitung Luas Daerah dengan Kotak

Calculate areas of rectangles with fractional side lengths by partitioning and counting areas of unit size in this activity.
Putting It All Together
[i]Answer these open ended questions on your own or with others to form deeper math connections.[/i]
The product of 4 and 5 is 40. The product of [math]5\frac{1}{2}[/math] and [math]8\frac{1}{4}[/math] is [math]45\frac{3}{8}[/math]. Where did the 5 come from in the product [math]45\frac{3}{8}[/math]?
How is the fraction part of the product of mixed numbers determined?
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Information: Menghitung Luas Daerah dengan Kotak