Rate, Unit Rate, Ratio, Proportions

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Across
  1. 2. It's the number that is neither positive nor negative
  2. 5. The set of whole numbers, opposites and zero
  3. 8. The answer to an addition problem
  4. 9. The answer to a subtraction problem
  5. 11. The "comparison" of two ratios
  6. 14. The distance a number is from zero on the number line
  7. 15. The bottom number in a fraction
  8. 17. This type of fraction has a numerator that is larger than the denominator
  9. 18. A special ratio with a denominator of 1
  10. 19. The constant of ......?
Down
  1. 1. A comparison of two numbers such as 300 miles in 5 hours
  2. 3. 1/2 and 2/4 are these types of fractions
  3. 4. The answer to a multiplication problem
  4. 6. A line used to represent numbers
  5. 7. Comparison of two or more numbers
  6. 10. K in the formula K=y/x represents a _______
  7. 12. The answer to a division problem
  8. 13. The top number in a fraction
  9. 16. A ratio represents this type of mathematical operation