Box A has 23 packets and each packet has 195 seeds. Box B has 31 packets and each packet has 203 seeds. Calculate the total number of seeds in both boxes. (By rounding off to the nearest tens)

10,000 seeds

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8,000 seeds

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9,000 seeds

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11,000 seeds

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Solution

The correct option is A 10,000 seeds
Say:
$∙$ Estimation is approximating the given value to make the calculation easier.

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

Steps:
$∙$ How many packets does Box A have?
Ans: 23

$∙$ What is the estimated value of 23?
Ans: 20 (WB1)

$∙$ How many seeds each packet has for Box A?
Ans: 195

$∙$ What is the estimated value of 195?
Ans: 200 (WB1)

$∙$ How many seeds are there in Box A?
Ans: 200 × 20 = 4,000 (WB2)

$∙$ How many packets does Box B have?
Ans: 31

$∙$ What is the estimated value of 31?
Ans: 30 (WB3)

$∙$ How many seeds does each packet have for Box B?
Ans: 203

$∙$ What is the estimated value of 203?
Ans: 200 (WB3)

$∙$ How many seeds are there in Box B?
Ans: 200 × 30 = 6,000 (WB4)

$∙$ Which operation do we use to calculate the total number of seeds in both boxes?
Ans: Addition

$∙$ How many seeds are there in both boxes?
Ans: 4,000 + 6,000 = 10,000 (WB5)

WB1:

WB2:

WB3:

WB4:

WB5:

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