Maths definitions

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Across
  1. 3. are the answers to the crossword clues:
  2. 7. Whole numbers, including positive, negative numbers.
  3. 8. Plural of formula; symbolic expressions representing relationships between quantities.
  4. 9. A proposed mathematical statement that has not yet been proven or disproven.
Down
  1. 1. A numerical factor multiplying a variable in an algebraic expression.
  2. 2. A single mathematical expression that can be a number, variable, or product of both.
  3. 4. To replace a variable in an expression with a given value.
  4. 5. Numbers that can be expressed as the quotient of two integers.
  5. 6. The exponent indicating how many times a base is multiplied by itself.