www.VirtualNerd.com

What's a Real Number?

What is a real number?

Summary

  1. π is the symbol for the Greek letter "pi"
  2. π stands for a special number, approximately equal to 3.14159, that is used in geometry and other areas of math
  3. -4 can be found on the number line, so it is a real number
  4. -2.5 can be found on the number line, so it is a real number
  5. 1.4142 can be found on the number line, so the square root of 2 is a real number
  6. 3.1415926 can be found on the number line, so π is a real number

Notes

    1. Rational numbers are numbers that can be expressed as a simple fractions
    2. Irrational numbers are numbers with decimals that never repeat and never end
    3. Both of these types of numbers can be found on a number line
    1. We want to see if we can find each of these numbers on a number line
    2. If we can, that means they are real numbers
    3. π is the symbol for the Greek letter "pi"
    4. π stands for a number, approximately equal to 3.14159, that is used frequently in geometry and other areas of math
    1. We want to see if we can find each of these numbers on a number line
    2. If we can, that means they are real numbers
    1. If we can find -4 on the number line, then we know it is a real number
    2. -4 CAN be found on the number line!
    1. Since we found -4 on the number line, it is a real number
    1. If we can find -2.5 on the number line, then we know it is a real number
    2. -2.5 CAN be found on the number line, so it is a real number!
    1. Remember, real numbers can be found ANYWHERE on the number line
    2. Even though -2.5 is not on one of the markers, it is still on the line
    3. So that means it's still a real number
    1. Remember, real numbers can be found ANYWHERE on the number line
    2. Even though -2.5 is not on one of the markers, it is still on the line
    3. So that means it's still a real number
    1. If we can find 1.4142 on the number line, then we know that the square root of 2 is a real number
    2. We CAN find 1.4142 on the number line, so we know that the square root of 2 is a real number
    1. π is the symbol for the Greek letter "pi"
    2. π stands for a special number, approximately equal to 3.14159, that is used frequently in geometry and other areas of math
    1. π is the symbol for the Greek letter "pi"
    2. π stands for a special number, approximately equal to 3.14159, that is used frequently in geometry and other areas of math
    1. If we can find 3.1415926 on the number line, then we know that π is a real number
    2. We CAN find 3.1415926 on the number line, so we know that π is a real number