Lesson 4-3

For Examples 1-2  Multiply Decimals
a. Find 3.8  5.2.	Estimate 3.8  5.2 → 4  5 or 20

    3.8	 one decimal place
  5.2		 one decimal place	
     76
 190   
19.76	 two decimal places

The product is 19.76.	Compared to the estimate, the product is reasonable.

b. Find 2.3  0.04.	Estimate 2.3  0.04 → 2  0 or 0

      2.3	 one decimal place
  0.04	 two decimal places
  0.092		 three decimal places	

The product is 0.092.	Compared to the estimate, the product is reasonable.

For Example 3 
c. [Real-World Example]INCOME   Josephine works at a job where she earns $7.40 per hour. How much would her paycheck be for a week in which she works 26.25 hours?

Estimate 26.25  7.40 → 26  7 or 182

     26.25	 two decimal places
     7.40     two decimal places
  10500

The product has four decimal places. You can drop the two zeros at the end because 194.2500 = 194.25.

18375 
194.2500 	 

Josephine’s paycheck would be $194.25.