Number Theory

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Across
  1. 6. The amount left over after division.
  2. 7. A _ _ _ _ _ _ number is the result of multiplying a number by itself.
  3. 10. A positive integer with more than two factors.
  4. 11. The set of numbers including 0, 1, 2, 3, …
  5. 13. A number that can be written as a fraction.
  6. 15. A number that cannot be written as a fraction.
  7. 17. A natural number that can be divided exactly by 2.
  8. 18. The set of negative and positive natural numbers and zero.
  9. 19. The smallest common multiple of two or more numbers.
  10. 20. A number used for counting: 1, 2, 3, 4, …
  11. 21. The first positive integer.
  12. 22. The result of multiplying two or more numbers
Down
  1. 1. A number with exactly two factors: 1 and itself
  2. 2. The number that appears below the line in a fraction.
  3. 3. The number that appears above the line in a fraction.
  4. 4. A whole number greater than zero is called a _ _ _ _ _ _ _ _ integer.
  5. 5. The number that has no positive or negative value.
  6. 8. A square _ _ _ _ is a number multiplied by itself to produce a square number.
  7. 9. A number obtained by multiplying another number by an integer.
  8. 12. The greatest number that divides two or more numbers exactly.
  9. 14. A number that divides another number exactly
  10. 16. The set containing both rational and irrational numbers.
  11. 23. A natural number that cannot be divided exactly by 2.