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Questions Answers and Explanations

      1

      (a) 80.

      (b) 220.

      (c) 1,890.

      (d) 6,500.

      2

      (a) 300.

      (b) 2,300.

      (c) 8,000.

      (d) 40,000.

      3

      (a) 7,000.

      (b) 9,000.

      (c) 23,000.

      (d) 800,000.

      4

      (a) 5,000,000.

      (b) 11,000,000.

      (c) 99,000,000.

      (d) 5,556,000,000.

      5 280.. The answer before rounding? It’s 285!

      6 5,500.. The answer before rounding is 5,578.

      7 1,400.. The answer before rounding: 1,507.

      8 7,000.. The answer before rounding? It’s 6,836!

      In the section that follows, you’ll find a quiz that tests your rounding and estimating skills from this chapter.

Whaddya Know? Chapter 3 Quiz

      Answer these 12 questions to test the skills you learned in this chapter. When you’re done, flip to the next section for answers and explanations.

      1 Which digit is in the ten-thousands place of the number 34,921,706,488?

      2 Which digit is in the hundred-thousands place of the number 987,654,321,000?

      3 Which digit is in the millions place of the number 7,261,945,803?

      4 Round the number 875,921 to the nearest hundred.

      5 Round the number 875,921 to the nearest thousand.

      6 Round the number 805,921 to the nearest hundred-thousand.

      7 Round the number 805,921 to the nearest million.

      8 Round the number 55,555 to the nearest ten.

      9 Estimate the sum by rounding each number to the nearest ten before adding:

      10 Estimate the sum by rounding each number to the nearest hundred before adding:

      11 Estimate the result by rounding each number to the nearest ten before adding and subtracting:

      12 Estimate the result by rounding each number to the nearest million before adding and subtracting:

Answers to Chapter 3 Quiz

      1 0. Ten-thousands place: 34,921,706,488?

      2 3. Hundred-thousands place: 987,654,321,000?

      3 1. Millions place: 7,261,945,803?

      4 875,900.

      5 876,000.

      6 800,000.

      7 1,000,000. Add a leading 0 to the beginning of the number, in the millions place.

      8 555,560.

      9 1,880.. What is the sum if you don’t round? It’s 1,877!

      10 1,900.

      11 290.. The answer before rounding? It’s 291!

      12 193,000,000.. The answer before rounding is 192,821,521.

Chapter 4

      Staying Positive with Negative Numbers

      IN THIS CHAPTER

      

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