Word problem hints

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Across
  1. 3. Doubling it together
  2. 5. I paid_ for the toy-clue starts with l ends with s
  3. 7. A two letter word that means multiply
  4. 8. I have _ of the same thing -clue means the same as twice
  5. 10. 7 letter word means to add
  6. 11. 5 letter word that starts with s
  7. 13. 5 letter word that means group
  8. 15. To lose take away
  9. 16. Means multi what is the rest
  10. 17. Split up
  11. 18. To split up
Down
  1. 1. combined together
  2. 2. To take away
  3. 4. means subtract and what is left
  4. 6. 3 letter word for add
  5. 9. 4 letters means subtract
  6. 11. down scale the opposite of up
  7. 12. 3 letter word to combine
  8. 13. scale plus a two letter word for
  9. 14. To add something together