Crossword - Number Sense

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Across
  1. 2. a quantity obtained by multiplication
  2. 4. one of two equal parts of a divisible whole
  3. 5. an approximate calculation of quantity or degree or worth
  4. 6. the quotient of two rational numbers a fraction is a division problem!!!
  5. 8. a quantity obtained by the addition of a group of numbers
  6. 11. put or add together
  7. 12. a number that has no factor but itself and 1
  8. 13. put or add together
  9. 14. the divisor of a fraction the bottom number of a fraction
  10. 16. the arithmetic operation of summing
  11. 17. a number that is combined with another number
  12. 19. fewer
  13. 20. quantifier meaning a smaller number of
  14. 21. any of numbers that form a product when multiplied together
Down
  1. 1. the whole amount
  2. 3. the number that remains after subtraction
  3. 7. not used up
  4. 9. greater in size or amount or extent or degree
  5. 10. made less in size or amount or degree
  6. 15. an arithmetic operation that is the inverse of division
  7. 18. the dividend of a fraction