Chapter 5.2, Problem 8P

Explain how to write 1.89 and 3.57 as improper fractions whose denominators are products of 10s. Then use fraction multiplication to explain where to place the decimal point in the solution to $1.89\times 3.57$ . Show how to use the products to 10s in the denominators to explain why we add the number of digits behind the decimal points in 1.89 and 3.57.