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Across
  1. 3. the opposite of subtraction
  2. 4. a number used to multiply a variable
  3. 9. addition and subtraction
  4. 10. the opposite of addition
  5. 12. two things are equal
  6. 13. 2L+2W
  7. 14. a set of values that make a statement true
  8. 17. a diagram of values
  9. 18. a fixed value
  10. 19. length x width
  11. 20. to make simpler
Down
  1. 1. a symbol for a number we don't know yet
  2. 2. the opposite of division
  3. 5. two values are not equal
  4. 6. to replace another number
  5. 7. a(b + c) = ab + ac
  6. 8. to calculate the value
  7. 11. the opposite of multiplication
  8. 15. separating the variable
  9. 16. the answer