School stuff

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Across
  1. 2. what you do in soccer / football
  2. 5. 1 divided by two?
  3. 6. synonym for matter
  4. 8. synonym for add
  5. 9. 1 times three
  6. 12. word form of 28
  7. 13. food you eat at around noon
  8. 14. 1-1=__
  9. 15. green things you see on plants / trees
Down
  1. 1. small / big device that you type on
  2. 3. An object to sit on
  3. 4. (5x2)+7
  4. 7. ten times itself
  5. 10. head wearing
  6. 11. word for a number with 9 trailing 0s