To a nonmathematician, having the letter "i" represent a number that does not quite exist and is "imaginary" can be hard to ...

Now the original numbers are arranged in descending order with the biggest number on the left and the smallest on the right. Do you feel confident converting and ordering fractions, percentages ...

Remember, a square root of a number represents a number whose square is the original number. A positive number times itself is a positive number. A negative number times itself is a positive number.