Q - the notation denoting rational numbers, a rational number is - a number that can be written as p/q, where p and q are integers but q is not equal to 0, N and Z are - subsets of Q, numerator - the top number of a fraction, denominator - the bottom number in a fraction, 'of' means - multiplication, proper fractions - numerator is less than denominator, always less than 1, improper fractions - numerator is equal to or greater than the denominator, mixed numbers - integers and proper fractions together, equivalent fractions - fractions that represent the same amount, to find equivalent fractions - multiply or divide the numerator and the denominator by the same number, to order fractions - write them as equivalent fractions and put them in ascending or descending order, adding and subtracting fractions - bring all to the lowest common denominator and add or subtract the numerators, multiplying fractions - top by top/bottom by bottom, dividing fractions - flip the second fraction, flip the operation, the reciprocal of a/b is - b/a, simplest form - dividing numerator and denominator by the same number until it's not possible anymore, to express a quantity as a fraction as another - both quantities need to be in the same units,

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