Number System Basics: Test 1

Among the above, the counting number is only 6 because counting numbers can only be natural numbers.

Whole numbers are essentially counting numbers, zero included. Remember whole numbers would always take positive integral values. Since we have no such number in the options, the correct answer is option D

Rational numbers are those which can be written in the form of p/q,
Out of the options, only option B can be written in this format.
Remember √2 is not a rational number.

Option 1 is ruled out because it is a rational number Option b is also a rational number So the right answer is 0 which is a integer but neither positive nor negative, that is option C

Since we are asked for the thousand value so we will approximate the thousand value of the number to the nearest rounding figure The number can be written as 200000 + 78000 +800 +90 So now we approximate the 78000 value to the 79000. So the best option for this problem is option d