## Numbers

##### Across
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 _________ .