Math crossword

123456789101112
Across
  1. 3. what clocks show
  2. 4. the nothing number
  3. 6. what we use to count
  4. 8. puffy animals that go baa
  5. 9. Miss Testut's subject
  6. 10. who gave us zero
  7. 12. what we call math
Down
  1. 1. what we do with numbers
  2. 2. what ancient Egyptians use to write
  3. 5. What Aapeli used to count sheep
  4. 7. it commonly has numerals after it
  5. 11. the people who spread zero