If a car travels 9,923 m on Day 1 and 2,227 m on Day 2, estimate the total distance traveled by the car on both days in kilometers. (Round off to the nearest tens)

12 km 250 m

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11 km 150 m

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11 km 750 m

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12 km 150 m

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Solution

The correct option is D 12 km 150 m
Say:
$∙$ Estimation is approximating the given value to make the calculation easier.

$∙$ Round off the given numbers to the nearest tens.

Steps:
$∙$ What is the distance traveled by car on Day 1?
Ans: 9,923 m

$∙$ What is the estimated value of 9,923?
Ans: 9,920 (WB1)

$∙$ What is the distance traveled by car on Day 2?
Ans: 2,227 m

$∙$ What is the estimated value of 2,227?
Ans: 2,230 (WB1)

$∙$ Which operation do we use to find the estimated distance traveled by the car on both days?
Ans: Addition

$∙$ What is the estimated distance traveled by the car on both days in meters?
Ans: 9,920 + 2,230 = 12,150 m (WB2)

$∙$ What is the estimated distance traveled by car on both days in kilometers?
Ans: 12 km 150 m (WB2)

WB1:

WB2:

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