Maths fun

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Across
  1. 2. Square root of 16
  2. 4. The opposite of Addition
  3. 9. The opposite of multplication
  4. 10. the number I multiply with to get the answer 'zero'
  5. 11. Middle of the day can be called ?
  6. 12. 2 Cubed (2 to the power of 3)
  7. 13. The only number that has the same number of letters as its value
  8. 15. a number that can only be divided by itself and 1.
  9. 17. 1/5 X 1/5 = 1 ?
  10. 20. A half of a half is a ?
Down
  1. 1. What 3D shape has 6 even Faces?
  2. 3. 1000 grams is eqaul to 1 ?
  3. 5. Te Reo for 3
  4. 6. Number of sides a nonagon has
  5. 7. 10% of 150
  6. 8. a quarter of 20
  7. 14. 12 - 3 X 2
  8. 16. How many vertices does a cuboid have?
  9. 18. The next prime number after 7
  10. 19. Te Reo for 10