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  1. 6. A famous irrational number that is related to Biology.
  2. 7. numbers you can multiply together to get another number: Example: 2 and 3 are _______ of 6, because 2 × 3 = 6.
  3. 8. Natural numbers along with zero is called ________.
  4. 9. A part of a whole.
  5. 11. a number that can be expressed in the form a + bi, where a and b are real numbers and i is the imaginary unit, that satisfies the equation i2 = −1.
  6. 12. What type of number is the square root of 250?
  7. 15. __________ are formed by multiplying a digit by itself three times.
  8. 16. A decimal with a finite number of digits.
  9. 17. Negative numbers along with whole numbers is called__________ .
  10. 18. The branch of mathematics dealing with the properties and manipulation of numbers.
  11. 19. a positive integer that has at least one positive divisor other than one or the number itself.
Down
  1. 1. What does the letter 'R' represents in math.
  2. 2. What type of number is the square root of 296?
  3. 3. 120,240,360,480,.... are the ________ of 120.
  4. 4. A decimal with infinite number of digits.
  5. 5. The greatest all-round mathematician of all time.
  6. 10. A complex number of the form w xi yj zk, where w, x, y, z are real numbers and i, j, k are imaginary units that satisfy certain conditions.
  7. 13. a set of numbers that start from 1 and then goes on .....
  8. 14. the product of a number multiplied by itself, e.g. 1, 4, 9, 16.
  9. 20. Natural numbers greater than 1 that has no positive divisors other than 1 and itself are called _________ .