Mathematical language - Number theory basics

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Across
  1. 2. Largest factor of two numbers
  2. 5. The things in common between a group of sets
  3. 7. The set of counting numbers, negative counting numbers and zero
  4. 9. Smallest product that is divisible by two numbers
  5. 10. A number that divides evenly into another is a <blank> of that number
  6. 12. An integer times some number is a this of that number
  7. 13. The top part of a fraction
Down
  1. 1. An integer that is not prime
  2. 3. A law that shows how to distribute multiplication over addition
  3. 4. The bottom part of a fraction
  4. 6. This of two numbers is their multiplication
  5. 8. This of a number is one over that number
  6. 11. An integer whose only proper divisors are one and itself