1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Across
2.a set with no elements
4.an amount charged for the use of money
7.a set which contains all elements of all sets being considered in a certain discussion
9.a number that possesses more than two different factors
10.set of all subsets
12.an amount deducted from the original price
14.two fractions that represent the same part of a whole
16.fractions with different denominators
17.a method showing the relationships among sets using a rectangle, which represents the universal set and circles which represents the sets
18.the amount paid to a person or agent for the services rendered
Down
1.a collection distinct objects
2.numbers that are also called counting numbers
3.two sets with exactly the same elements
4.a fraction whose numerator is higher than the denominator
5.a part of a whole
6.equality between two ratios
8.a real number that cannot be expressed as the quotient of two integers
11.a proportion whose change in one produces a corresponding change to the other in the opposite direction
13.the number of elements in a set
15.a natural number that possesses exactly two different factors, itself and one

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