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26 May, 04:02

A gear in a machine makes 49 revolutions per hour. About how many revolutions does the gear make in 5 days?

Create an expression to model the given situation. Then, use estimation strategies to find approximately how many revolutions the

gear makes in 5 days.

1,200

5,000

24

60

50

10

40

6,000

x 12 x 49

$ 120

+3
Answers (2)
  1. 26 May, 04:47
    0
    Estimated: 6000 revolutions

    Actual: 5880 revolutions

    Step-by-step explanation: (Estimation)

    First, we should round 49 to 50.

    Next, we should convert 5 days to hours to match the per hour rule.

    5 days - -> 120 hours

    Then, multiply 120 by 50 to get 6000 or you can take out the 0 in 120 so it might be easier for you.

    (Acutal)

    First, Convert 5 days to 120 hours to match the per hour rule.

    Next, multiply 120 by 49 to get 5880 or take out the 0 in 120 to make it easier for you.
  2. 26 May, 07:35
    0
    24, 10, 50, 6,000 (They are in order)

    Step-by-step explanation:

    It is given that the gear makes 49 revolutions per hour. So, to determine an expression to represent the number of revolutions a gear makes in 5 days, multiply the product of 5 days and 49 revolutions by 24 hours per day.

    Next, use the associative property to create an equivalent expression. So, 24 is equivalent to the product of 2 and 12, and the product of 5 and 2 is 10.

    In the third step, multiply 10 and 12, and estimate 49 as 50.

    Finally, multiply 120 by 50.

    The following shows a correct method to find the approximate number of revolutions the gear makes in 5 days.

    So, the gear makes approximately 6,000 revolutions in 5 days.
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