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Question

There are 775 red bags and 645 blue bags. The cost of each red bag is $$ 92$ and the blue bag is $$ 95$ . Estimate the total cost of red and blue bags. (Round off to the nearest hundreds)

$340,000

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$140,000

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$240,000

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$160,000

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Solution

The correct option is B $140,000
Say:
$∙$ Estimation is approximating the given value to make the calculation easier.

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

Steps:
$∙$ How many red bags are there?
Ans: 775

$∙$ What is the estimated value of 775?
Ans: 800 (WB1)

$∙$ What is the cost of each red bag?
Ans: $$ 92$

$∙$ What is the estimated value of 92?
Ans: 100 (WB1)

$∙$ What is the total estimated cost of red bags?
Ans: $800 \times $ 100 = $ 80, 000$ (WB2)

$∙$ How many blue bags are there?
Ans: 645

$∙$ What is the estimated value of 645?
Ans: 600 (WB3)

$∙$ What is the cost of each blue bag?
Ans: $$ 95$

$∙$ What is the estimated value of 95?
Ans: 100 (WB3)

$∙$ What is the total estimated cost of blue bags?
Ans: $600 \times $ 100 = $ 60, 000$ (WB4)

$∙$ What is the total estimated cost of red and blue bags?
Ans: $$ 80, 000 + $ 60, 000 = $ 140, 000$ (WB5)

WB1:

WB2:

WB3:

WB4:

WB5:

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There are 775 red bags and 645 blue bags. The cost of each red bag is $92 and the blue bag is $95. Estimate the total cost of red and blue bags. (Round off to the nearest hundreds)

There are 775 red bags and 645 blue bags. The cost of each red bag is $$ 92$ and the blue bag is $$ 95$ . Estimate the total cost of red and blue bags. (Round off to the nearest hundreds)