math crossword puzzle

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Across
  1. 1. a subject you use numbers in
  2. 2. a book you use in math
  3. 4. you use this sign when you add
  4. 8. you use this to get the sum
  5. 9. if you are having troubles you are having what
  6. 10. you use this to get the diference
  7. 11. you use this when you subtract
  8. 13. you use this sign when you divide
Down
  1. 1. you use this sign when you multiply
  2. 3. work you do at home
  3. 5. another word for digit
  4. 6. you spend this at the store
  5. 7. you use this ti get the product
  6. 12. another word for numbers
  7. 13. you use this to get the quoteint