Crossword Time!

3. It is a collection of rational and irrational numbers.
5. It is the highest number that divides 2 or more numbers exactly.
6. It is a real number written as a ratio of integers with a non-zero denominator.
10. A whole number that has factors other than 1 and the number itself.
12. It is the graph of a pair linear equations where a1/a2≠b1/b2
13. A proven statement used for proving another statement.
14. It is a method of solving a system of equations wherein one of the equations is solved for one variable in terms of the other variables.
17. When the lines of the graph representing a pair of equations are intersecting, the solution is _________.
18. It is the graph of a pair linear equations where a1/a2=b1/b2=c1/c2 .
19. A series of well defined steps which gives a procedure for solving a type of problem.
20. It is an algebraic expression where the constants are real numbers and the exponent of the variables are whole numbers.

1. If the sum of the proper divisors of a number is equal to the number itself, then that number is called as a ________.
2. Any real number that cannot be expressed as a ratio of integers.
4. A number used to multiply a variable.
7. The _____ theorem of arithmetic states that every natural number greater than 1 can be written as a unique product of prime numbers.
8. It is the smallest non-zero number that is a common multiple of two or more numbers considered.
9. The decimal expansion of a real number which has a finite number of digits after the decimal point.
11. It is the graph of a pair linear equations where a1/a2=b1/b2≠c1/c2 .
15. It is the product of a number and any other whole number.
16. A positive integer that has exactly two factors, 1 and the number itself.