Math puzzle

12345678910111213
Across
  1. 2. Four sided polygons
  2. 3. Polygons that have equal sides and equal angles
  3. 8. Fractions that have the same value
  4. 9. Flat shapes that do not have depth
  5. 11. Approximate or guessed value
  6. 12. A series of numbers in order, which are connected by some operation.
  7. 13. A bigger or smaller drawing of an object an actual object
Down
  1. 1. Numbers that are easy to work with, like numbers ending in zeroes
  2. 4. Product of a number multiplied by itself and can be arranged in a square shape.
  3. 5. The time interval between two times
  4. 6. To find out what a number means — how much there is in it
  5. 7. Something which is limited and can be counted
  6. 10. The amount of space inside a 2-dimensional closed shape