Maths

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Across
  1. 4. A symbol that doesn't have a fixed value
  2. 6. A method of writing numbers as the product of their factors or divisors
  3. 7. An equality of ratios a:b=c:d
  4. 8. A ratio that compares two quantities with different units
Down
  1. 1. If an increase in one leads to a decrease in the other.
  2. 2. If and increase in one quantity corresponds to a constant increase in the other
  3. 3. A fixed numerical value
  4. 5. Are terms that have the same variable and powers