week of math

123456789
Across
  1. 1. the result of adding two or more numbers
  2. 7. a mathematical operation that indicates how many times a number is added to itself
  3. 8. starters of math
  4. 9. figure with three corners
Down
  1. 1. the process of taking away a number from another
  2. 2. a mathematical operation which involves the sharing of an amount into equal-sized groups
  3. 3. a figure with four corners
  4. 4. the ratio of the circumference of any circle to the diameter of that circle
  5. 5. figure without any corners
  6. 6. whats 2+2?