Math Puzzle

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Across
  1. 2. Fractions with an integer before the fraction
  2. 6. An substance that is refined for sale
  3. 7. The process or skill of multiplying
  4. 8. Fractions whose numerator is more than the denominator
  5. 11. The cluster created by counting numbers and zero
  6. 12. The prodcess of subtract something from something else
  7. 13. The order of arithmetic numbers
Down
  1. 1. that divisible by two
  2. 3. The process of adding something to something else
  3. 4. Showing the ratio of equal parts to the whole as a result of dividing a whole into equal parts
  4. 5. A result obtained by dividing one quantity by another
  5. 9. Numbers that have a remainder of one when divided by two
  6. 10. He is the first mathematichian who is write the first book about algebria