Math vocab.

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Across
  1. 4. the numbers on which we operate can be moved or swapped from their position to get the same answer 2 wds
  2. 7. the length of the outline of a shape
  3. 10. a measure of how much space there is on a flat surface
  4. 11. to substitute a number for each variable and perform the arithmetic operations
  5. 14. to divide something or give a share or part of something 2 wds
Down
  1. 1. How much one number differs from another
  2. 2. any straight line segment that passes through the center of the circle 4 wds
  3. 3. compares two values, showing if one is less than or greater than the other
  4. 5. The distance around the edge of a circle
  5. 6. the result of multiplying
  6. 8. a statement that the values of two mathematical expressions are equal
  7. 9. any of the line segments from its center to its perimeter 4wds
  8. 12. the distance from zero 2wds
  9. 13. A symbol for a number we don't know yet
  10. 15. the aggregate of two or more numbers