Algebra words

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Across
  1. 2. To put numbers together
  2. 5. A number sentence with a missing number
  3. 6. The answer to a subtraction problem
  4. 8. To take one number away from another
  5. 9. Solve this: x plus 3 equals 7, x equals
  6. 10. The answer to an addition problem
Down
  1. 1. A rule that repeats or changes in a sequence
  2. 3. A letter that stands for a number
  3. 4. A symbol like plus or minus
  4. 7. The sign that means “the same as”