Addition and Subtraction terminologies

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Across
  1. 2. the process of removing away or taking away numbers from one another.
  2. 3. the result of subtracting one number from another.
  3. 4. is a quantity or number to be subtracted from another.
  4. 6. is putting numbers altogether.
Down
  1. 1. is a quantity or number from which another number is to be subtracted.
  2. 2. is the answer in addition.
  3. 5. are numbers to be added.