Calculate the value of the expression by appropriate rounding off of the numbers $3.72 \div 0.02$ :

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200

300

100

500

answer is A.

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Detailed Solution

Concept- It is the dividend that is rounded off when dividing because the divisor already has one significant digit and cannot be further rounded off to two because doing so would result in the denominator being zero because anything divided by zero is not defined.
The method of dividing 3.72 by 0.02 is to first divide 3.72 by 0.02 and then round off the result.
Thus, if we divide 3.72 by 0.02, we will get
=186
The number 186 will now be rounded off to the nearest hundredth.
In order to round off to the nearest 100s place, we will first examine the digit at the 10s place. If the digit is higher than or equal to five, one will be added to the number at the hundredth place.
In the number 186, the digit in the tens place is 8, which is greater than 5, so the number in the hundredths place, which is currently 1, will increase by 1 and become 2, while the digits in the tens place and unit place will change to 0 and 0 respectively.
Thus, 186 will become 200 when rounded to the closest hundred.
Hence, the correct answer is option 1.

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