By Glenda Lappan, James Fey, William Fitzgerald, Susan Friel, Elizabeth Philips

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1 Determining Tax A. 50. The sales tax is 6%. What will be the total cost of the CD? Try to find more than one way to solve this problem. Be prepared to explain the different methods you find. B. Using a sales tax of 6%, find the total cost for each item. 1. 00 magazine 2. 00 book on dogs 3. 50 comic book C. Use a sales tax of 7%. Find the total cost for each item in Question B. D. Use what you have learned to solve these problems. 1. Alexis bought a CD player. 80. What was the price of the CD player?

2 ounces of a sliced Italian ham called prosciutto (pruh SHOO toh) to make sandwiches. 4-ounce slice of prosciutto. How many sandwiches can he make? 2. Ms. 6 pounds of hamburger for a cookout. 25) burgers can she make? 3. Write a number sentence that shows the operations you would use to find your solutions in parts (1) and (2). 4. The answer to part (2) is not a whole number. What does the answer mean? qxd 5/27/05 3:11 PM Page 37 B. Examine each situation. Decide what operation to use and then estimate the size of the answer.

012 b. 1,240 4 320 c. 12,400 4 3,200 e. 2 f. 32 21. a. 37 4 10. b. 37? How is it different? c. Divide the quotient from part (a) by 10. 37, and how is it different? d. In general, what do you think happens to a decimal number when you divide it by 10? 22. a. Write two related problems with the same answer as 48 4 12. Explain. b. 12. Find the value of N, and then write the complete multiplication-division fact family. 23. 6 24. 4 25. Find the decimal equivalent for each of these fractions: 5 13 2 a.