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  1. Write the numbers one on top of the other right aligned (so that the last (unit) digit of each number line up in a column)
  2. Starting with the unit (rightmost) digits of the numbers and no carry
  3. Add the digits together with the carry (if any)
  4. write the units digit of the sum under the digits just added
  5. if the result is more than nine, note a carry of one (1) otherwise note no carry
  6. go to the next digits to the left of the ones just added
  7. If there is no next digit in both of the numbers and no carry then stop
  8. if either number has run out of digits, then take the digit to be zero (0)
  9. go to step 3
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