Maths Cross word puzzle

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Across
  1. 3. Smallest natural number
  2. 4. What is the answer is called of an addition question
  3. 6. What is the answer is called of a multiplication question
  4. 7. An even prime number
  5. 8. predecessor of the smallest two digit number
  6. 10. Founder of seive of eratosthenes method
Down
  1. 1. The second name of bar bracket
  2. 2. What is the answer is called of a substraction question
  3. 5. What is the answer of a division question is called
  4. 9. Smallest whole number