algebraic reasoning, integers, and rational numbers

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Across
  1. 1. rules for solving mathematical problems
  2. 4. has numbers and operations
  3. 8. has numbers, operations, and variables
  4. 9. a set of whole numbers and their opposites
  5. 10. substitute a number for the variable and solve
  6. 11. distance from zero
  7. 12. a number that is multiplied by a variable
Down
  1. 2. a number that is the same distance as another number from zero
  2. 3. a number that cannot change
  3. 5. a number that can be written as a fraction
  4. 6. separated by plus, minus, and equal signs
  5. 7. a letter that represents a number