Crossword??? HARD

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Across
  1. 2. add numbers a method frog
  2. 5. can be made to the nearest ten, hundred, unit and so on
  3. 8. another word for bigger
  4. 9. word for make a decision-guess
  5. 11. a method you use for subtraction
  6. 12. a unit
Down
  1. 1. a state of measurement
  2. 3. another word for guess
  3. 4. a thing that is always growing
  4. 6. another word for plus
  5. 7. tenth but on the other side of the decimal point
  6. 10. another word for small