Invisble math

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Across
  1. 2. what 9+10? 21 you stupid
  2. 6. Equation more than one step
  3. 9. Plankton
  4. 11. YOU SOLVED IT
  5. 12. opposite step
  6. 14. what you solved
  7. 15. a letter in math
Down
  1. 1. Opposite of add
  2. 3. Right ___
  3. 4. opposite of division
  4. 5. measured with a ruler
  5. 7. The total measurement of all sides
  6. 8. split into equal amounts
  7. 10. BIG BRAIN TIME (Starts with A)
  8. 13. c(a+b) = c(a)+b
  9. 16. wat class are u in :)