How well do you know your math?

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Across
  1. 2. Taking one from the next place to add here
  2. 3. To place values in the same column
  3. 4. Place to the right of tenths
  4. 5. Align these when adding/subtracting
  5. 6. A single digit spot in a number
  6. 7. A quick close answer used to check
  7. 9. Extra zeros to help like up places
  8. 10. Place left of hundredths
  9. 12. Another word for subtract
Down
  1. 1. Verify with an approximate total
  2. 3. Numbers to be added
  3. 5. the result of subtraction
  4. 8. Symbol between whole and fractional part
  5. 11. Result of addition