MYPUZZLEISTHEBEST

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Across
  1. 4. A quantity obtained by the addition of a group of numbers
  2. 7. Made less in size or amount or degree
  3. 9. (of an angle) Less than 90 degrees
  4. 11. A shape with five angles and five sides
  5. 12. First, outside, inside, last
  6. 13. The dividend of a fraction
  7. 14. The whole amount
  8. 16. A quantity obtained by multiplication
  9. 17. An arithmetic operation that is the inverse of division
  10. 19. Made greater in size, amount, or degree
  11. 20. Three terms
Down
  1. 1. Of an angle, between 90 and 180 degrees
  2. 2. A number that has no factor but itself and 1
  3. 3. The number obtained by division
  4. 5. The "U" shape graph created by quadratic equations
  5. 6. A six-sided polygon
  6. 7. The number that remains after subtracting
  7. 8. The divisor of a fraction
  8. 10. A shape with eight angles and eight sides
  9. 11. The arithmetic operation of summing
  10. 15. Put or add together
  11. 18. When an equation is true for all values of a variable.