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27 August, 00:12

Question 9 - (3 marks available)

By rounding to 1 significant figure, estimate the answers to these questions:

a) 17 * 82

b) 54 x 671

c) 207 x 643

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Answers (1)
  1. 27 August, 00:38
    0
    Answer: a) 1,600

    b) 35,000

    c) 120,000

    Step-by-step explanation:

    First, round each number to one significant digit (the first digit).

    Then multiply them.

    a) 17 - -> rounds to 20

    82 - -> rounds to 80

    20 x 80 = 2 x 8 with two zeros

    = 1 6 0 0

    b) 54 - -> rounds to 50

    671 - -> rounds to 700

    50 x 700 = 5 x 7 with three zeros

    = 3 5 0 0 0

    c) 207 - -> rounds to 200

    643 - -> rounds to 600

    200 x 600 = 2 x 6 with four zeros

    = 1 2 0 0 0 0
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