Question

Noah is on his trip to Kodaikanal. He wants to buy 6 keychains for each of his classmates. If he has 58 classmates, then he should get about ____ keychains.

• A. 360
• B. 300
• C. 200
• D. 240

Answer 1

The correct option is A 360

Number of keychains to be bought for each classmate = 6
Total number of classmates = 58

To find the total number of keychains that he has to get for all of them, we need to multiply 58 by 6.
But since 58 is close to 60, the product $58\times 6$ is best estimated by the product $60\times 6,$ which is 360.

Thus, Noah has to get about 360 keychains in all.

$458\underset{–}{\times 6}=\underset{–}{348}$

$58\times 6=348$ is indeed close to 360. Thus, 360 is a good estimate.