91Ó°ÊÓ

Problem 6

a. Estimate: \(3850 \div 52\) b. Find the exact answer. c. Is your estimate lower, higher, or the same?

Problem 6

a. List all possible factorizations of 30 and 105 . b. How many different factorizations do each of these numbers have?

Problem 6

a. Estimate the sum: \(326+474\) b. Determine the actual sum. c. Was your estimate higher, lower, or the same as the actual sum?

Problem 6

a. Explain why the result of \(72 \div 8+4\) is 13 . b. Explain why the result of \(72 \div(8+4)\) is 6 .

Problem 6

a. Evaluate: \(72 \cdot 23\) b. Evaluate: \(23 \cdot 72\) c. Are the answers to parts a and b the same? d. What property do the results of this exercise demonstrate?

Problem 6

You use a check to purchase this semester’s textbooks. The total is \(\$343.78\). How will you write the amount in words on your check?

Problem 7

Explain why 90,210 is less than 91,021.

Problem 7

Evaluate the following expressions. Check your answers with a calculator. a. \(48 /(4+4)\) b. \((8+12) /(6-2)\) c. \(120 \div(6+4)\) d. \(64 \div(6-2) \cdot 2\) e. \((16+84) \div(4 \cdot 3-2)\) f. \((6+2) \cdot 20-12 \div 3\) g. \(39+3 \cdot(8 \div 2+3)\) h. \(100-(81-27 \cdot 3) \div 3\)

Problem 7

Evaluate by finding the product in parentheses first. a. \(7 \cdot(13 \cdot 20)\) b. \((7 \cdot 13) \cdot 20\) c. Are the answers to parts a and b the same? d. What property do the results in parts a and b demonstrate?

Problem 7

Evaluate. a. \(123-91\) b. \(543-125\) c. \(78-49\) d. \(1002-250\) e. \(2001-1962\) f. \(696-384\)