easy

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Across
  1. 1. used to show that something is almost, but not completely, accurate or exact; roughly.
  2. 4. (especially with reference to a country with separate areas of government) the action or state of dividing or being divided into parts.
  3. 7. relating to or denoting a system of numbers and arithmetic based on the number ten, tenth parts, and powers of ten.
  4. 8. a rough calculation of the value, number, quantity, or extent of something.
  5. 10. the basis of our entire number system.
  6. 13. a number which is not a fraction; a whole number.
  7. 14. a figure, symbol, or group of figures or symbols denoting a number.
  8. 15. alter (a number) to one less exact but more convenient for calculations.
Down
  1. 2. the action of speaking or acting on behalf of someone or the state of being so represented.
  2. 3. estimate, measure, or note the similarity or dissimilarity between.
  3. 5. a particular order in which related things follow each other.
  4. 6. any of the numerals from 0 to 9, especially when forming part of a number.
  5. 9. a number which is not a fraction; a whole number.
  6. 11. come close or be similar to something in quality, nature, or quantity.
  7. 12. a circumstance, fact, or influence that contributes to a result.