Question

If A is a digit and the decimal $3.0A9$ can be rounded off to its nearest tenths as $3.1$, then A can be ___

• A. 4
• B. 3
• C. 6
• D. 2

Answer 1

The correct option is C 6

To round a decimal at any place, look for the digit in the place on its right.

If the digit on the right is higher than 5, then the decimal is rounded up.

And if the digit on the right is less than 5, then the decimal is rounded down.

So, for $3.0A9$ to be rounded up to $3.1$, the digit A should be atleast as big as 5.

Hence, the value of A is 6.