FANTASTIC MATH!!!

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Across
  1. 2. It is the sum of all the data in a set of data divided by the number of data.
  2. 5. A point on a line that is in the middle.
  3. 8. The fraction that the numerator is smaller than the denominator.
  4. 11. A straight line that is draw from top to the bottom.
  5. 12. When a line is perpendicular to another line, the angle between them is a ( ).
  6. 14. It is also a form of improper fraction, and the mixed fraction contains two parts: the integral part and the fraction part.
  7. 16. It is a kind of arithmetic which shows the difference between two numbers.
Down
  1. 1. The position of each digit in a number.
  2. 3. The number that is written behind in the multiplication formula.
  3. 4. It generally refers to the angle between the two sides of a triangle which is the ( ) angle to the third side.
  4. 6. There are at least two equal sides.
  5. 7. It refers to the data with the number which appeared most of the time in the set of data. A set of data can have muliple modes, or it can have no mode.
  6. 9. It is the number that is multiplied in the multiplication formula, it always at the front of the equation.
  7. 10. A number that does not contain fractions or decimals, that can be zero and a natural number with a plus or minus sign.
  8. 13. A set of data is arranged in the order of small to large (or from large to small) and the number in the middle ( or the average of the two data in the middle).
  9. 15. It is a shortcut that adds up the same number.