Equations and expression

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Across
  1. 3. Expression A combination of variables, numbers, and operation symbols, lacking an equal sign
  2. 6. A mathematical phrase containing numbers, operations, and/or variables
  3. 8. The value of a variable that makes an equation true
  4. 9. Expression A combination of numbers and operations, without variables
  5. 11. Property Multiplying a sum by a number is the same as multiplying each addend separately
  6. 12. A fixed numerical value that does not change
  7. 14. A letter or symbol representing a changing or unknown value
Down
  1. 1. To calculate the value of an expression by substituting numbers for variables
  2. 2. A number multiplied by a variable, placed directly in front
  3. 4. Expressions Expressions that have the same value, even if they look different
  4. 5. A symbol representing a mathematical operation
  5. 7. To reduce an expression to a more compact form by combining like terms and applying operations
  6. 10. A mathematical sentence stating that two expressions are equal, featuring an equal sign
  7. 13. Property Grouping does not matter for addition or multiplication