Mathematics crosswords

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Across
  1. 2. 3 and 2 make?
  2. 3. What is even prime number
  3. 4. How many face has a cuboid
  4. 6. What is smallest whole number
  5. 8. What is smallest natural number
Down
  1. 1. Is 0 is a rational number
  2. 2. How many a rectangle has side
  3. 5. What is largest number
  4. 7. How many a cone has plane face