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Test 2 Review
Fractions, Square and Cube Roots, Rational and Irrational Numbers
Term | Definition |
---|---|
Adding Fractions | must have a common denominator. Once there is a common denominator, add the numerators and keep the denominator the same. |
Subtracting Fractions | must have a common denominator. Once there is a common denominator, subtract the numerators and keep the denominator the same. |
Multiplying Fractions | multiply straight across (multiply the numerators and multiply the denominators) |
Dividing Fractions | multiply by the reciprocal (flip the second and multiply!) |
Reciprocal | the fraction flipped upside down; the reciprocal of a number is 1 divided by the number |
Square Root ("radical") | a number that produces a given number when multiplied by itself. For example, the square root of 25 is 5 because 5 x 5 = 25 |
Cube Root | a number that produces a given number when multiplied by itself three times. For example, the cube root of 27 is 3 because 3 x 3 x 3 = 27 |
Rational Number | A number that can be written as a fraction. When written as a decimal, it terminates (ends) or repeats. |
Irrational Number | A number that cannot be written as a fraction. As a decimal, it never ends AND never repeats. |