Basic Math & Pre-Algebra All-in-One For Dummies (+ Chapter Quizzes Online). Mark Zegarelli
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Название: Basic Math & Pre-Algebra All-in-One For Dummies (+ Chapter Quizzes Online)

Автор: Mark Zegarelli

Издательство: John Wiley & Sons Limited

Жанр: Математика

Серия:

isbn: 9781119867265

isbn:

СКАЧАТЬ this wavy symbol, which means is approximately equal to: ≈.

      Suppose you want to add these number: math. This computation is tedious, and you may make a mistake. But you can make the addition easier by first rounding all the numbers to the nearest hundred and then adding:

math

      The approximate answer is 3,800. This answer isn’t far off from the exact answer, which is 3,792.

      5Yourturn Estimate math by rounding all values to the nearest ten before adding.

      6 Estimate math by rounding all values to the nearest hundred before adding.

      7 Estimate math by rounding all values to the nearest hundred before adding and subtracting.

      1

      (a) 80.math

      (b) 220.math

      (c) 1,890.math

      (d) 6,500.math

      2

      (a) 300.math

      (b) 2,300.math

      (c) 8,000.math

      (d) 40,000.math

      3

      (a) 7,000. math

      (b) 9,000.math

      (c) 23,000.math

      (d) 800,000.math

      4

      (a) 5,000,000.math

      (b) 11,000,000. math

      (c) 99,000,000.math

      (d) 5,556,000,000.math

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

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

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

      8 7,000.math. 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.

      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: math

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

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

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

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