Math crossword puzzle :) Henry Richmond

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Across
  1. 5. a number variable or the product of one of more numbers or variables
  2. 6. a number by which a number is multiplied
  3. 7. an operation that undo's another operation
  4. 9. expresion that consists of numbers and operations
  5. 10. expression that consists of numbers, operations and variables
Down
  1. 1. a numbers distance from 0 on a number line
  2. 2. a number that does not have a variable
  3. 3. a statement formed by placing an inequality symbol between two expressions
  4. 4. the simplification of an expression
  5. 8. a positive or negative number on a number line