Mathematics

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Across
  1. 3. Related to symbols and letters used to represent numbers in formulas.
  2. 5. The process of finding the size, length, or amount of something.
  3. 7. Replacing a variable with a known value.
  4. 8. The arithmetic operation of taking one number away from another.
  5. 9. The bottom number in a fraction.
Down
  1. 1. The distance around a circle.
  2. 2. The top number in a fraction.
  3. 4. A combination of numbers, variables, and operations without an equals sign.
  4. 6. A mathematical statement showing that two expressions are equal.