"Ultimate" Arithmetic

15 Points Per Correct Answer - No time limit  

1. A very easy one to warm up with! Six sevens are ? Answer: (A number)

2. What is XLII in Arabic numerals? Answer: (A number)

3. 101010 looks like a big number, but it's written in binary. What is its decimal equivalent? Answer: (A number)

4. What do you get if you divide the number of hours in a week by the sum of the sides on a triangle and the number of natural satellites of the earth? Answer: (A number)

5. What do you get if you regard the first two decimal places of Pi as an integer, and multiply it by the integral part of Pi? Answer: (A number)

6. A spider finds it easier to work in base eight rather than base ten. What is the decimal equivalent of a spider's 52? Answer: (A number)

7. Which number has just the three prime factors of two, three and seven? Answer: (A number)

8. Back to binary, again. 1100001 - (1011 x 101) = ? Give the answer in binary. Answer: (A binary number)

9. The Romans again, now. Multiply XXI by II and give the answer in Roman numerals. Answer: (A Roman number)

10. Divide the number of days in a leap year by the number of feet in a yard, then subtract the product of the number of ounces in a pound and the number of cents in a nickel. Answer: (A number)