What is your number sense?

We all use numbers every day but very few people know how they work in theory. This quiz is actually quite simple if you know your stuff, though it will seem quite difficult if you don't.

Give it a whirl and see just how good you are with numbers. If you are a student, challenge your classmates and even your teachers! If you are no longer in school, see how much you remember and compare with what you remember being taught when you were.

1. What is your age?
Under 18 Years Old
18 to 24 Years Old
25 to 30 Years Old
31 to 40 Years Old
41 to 50 Years Old
51 to 60 Years Old
Over 60 Years Old
2. What is your gender?
Male
Female
3. An odd number times an even number is always:
Odd
Even
It depends on the specific numbers
4. If a and b are both < 0, then a - b is:
Positive
Negative
It depends on the specific numbers
5. Which of the following numbers is divisible by 11?
1,524,334,250
1,524,334,251
1,524,334,252
1,524,334,253
6. What comes next in the list 1,3,7,15,...
25
29
31
32
7. Which one doesn't belong?
2
4
18
22
8. What is the sum of the first 100 counting numbers?
5,050
10,000
10,100
20,200
9. You receive the following job offer: Work for $.01 the first day. Each day pays double the previous day's wages. This continues for 30 days. Do you accept this deal?
No way, that's crazy.
What ever happened to "fair wages"?
I'm not sure, I'll have to think about it for a while
I'd be crazy not to.
10. Assuming no intermarrages, how many great-great-great grandparents are in your ancestory?
8
12
16
32
64
11. What is the geometric mean of 1 , 9 and 3?
3
4 1/3
9
27
12. The students in a history test took an exam and the average score was 80. Which of the following actions would raise the class average the most?
Add 10 points to each of the 5 lowest scores
Add 10 points to each of the 5 highest scores
Add 10 points to any of each of 5 scores, it doesn't matter
None of these actions will raise the class average
13. x + y = 28 and xy = 7. What is 1/x + 1/y?
1/4
4
5/28
Not enough info. to determine
14. If a $ b is defined as ab - a + b, then what is the value of 4 $ 5?
11
19
21
None of these
15. In a certain code, the numbers 8-6-13-23-26-2 stand for S-U-N-D-A-Y and 21-9-18-23-26-2 stand for F-R-I-D-A-Y. What day of the week do 7-19-6-9-8-23-26-2 stand for?
Tuesday
Wednesday
Thursday
Saturday
16. a,b,c,d and e are 5 numbers, all > 0, such that a < b < c < d < e. Which one of the following has the biggest value?
e/a
d/b
c/b
b/d
Not enough info. to tell
17. If x is a negative number, which of the following is always negative?
-x
(-x)^2
(-x)^3
x^3
x + 1/2

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