Mixed th

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Across
  1. 2. humans, primates, and few other animals use this body part to grip onto things
  2. 4. geometry, algebra, calculus, statistics
  3. 6. 23+7=__
  4. 7. the noise that lightning makes
  5. 9. you put this on your toothbrush
Down
  1. 1. a day once a year where you blow out candles
  2. 3. where your teeth, gums, and tongue are
  3. 5. you need these to chew
  4. 8. where your toilet is