No you don't
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Real numbers are all numbers which do not contain "i", when "i" represents the square root of -1. All numbers which do contain "i" are "imaginary numbers" and are not real numbers. This means that all numbers you'd ordinarily use are real numbers - all the counting numbers (integers) and all decimals are real numbers. So in answer to your question, all the real numbers that are not whole numbers are all the decimal numbers - including irrational decimals such as pi.
Always true. (Never forget that whole numbers are rational numbers too - use a denominator of 1 yielding an improper fraction of the form of all rational numbers namely a/b.)
for example if you are baking a cake you need to know the measurement of flour,etc...to put in it.you use a measuring cup,the measurement in an measurement cup is written in rational numbers(fraction. )
because somtimes there isn't an answer to every equation like what's the square root of -16.... there is no answer so we would just use an imaginary number which is i.It turns out that these are important in a practical sense. Imaginary numbers turn up all the time in quantum mechanics and certain types of electronic circuits as well.
you use negative numbers when measuring the temperature when playing golf or jeopardy! hope this helps! The only place negative numbers work is on paper. It is good when you are having trouble to answer a question.When you need help i would use a number line because it saves getting the answer wrong or even use your fingers because getting the answer wrong is more embarrasing than using your hands/fingers or using a number line...lol