What does 'NaN' mean in Javascript?

Which operator is used for addition in Javascript?

What is the result of 5 + '5' in Javascript?

Which Javascript function can round a number to the nearest integer?

What does the 'Math.random()' function return?

Which Javascript operator performs division?

What is the value of 'Math.PI' in Javascript?

Which function returns the largest integer less than or equal to a number?

What does the '%' operator do in Javascript?

Which function is used to find the square root of a number in Javascript?