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Whole Numbers
Numbers with holes
Fractions
What would you do?
Did I make a Mistake
100
How many 2-digit numbers under a hundred have Only odd digits?
25
100
If I write down all numbers from 1 to 100, how many 0s will I have written
11
100
What is (1/2 + 1/2 +1/3+1/3+1/3 + 1/5+1/5+1/5+1/5+1/5)
3
100
One bag contains all 3 digit palindromes. The second bag contains all 4-digit palindromes. Which one would you pick to win an iPAD. If both bags contain the same number of numbers, you say none and you still will the iPAD. What will be your choice?
None.
100
I add 15 odd numbers and multiply the sum by 15. I divide the result by 4 and I get a remainder of 2.
Yes, you can get remainders of only 1 or 3
200
What is 13+26+39+52+65+79+91+104+117+130
13*55=715
200
What is the smallest number made of just 7s and 0 (both these numbers must be used) so the resulting number is divisible by 9
7077777777
200
13 is exactly half way between 12.3 and what number
13.7
200
I two two fair dice (each with numbers 1 to 6 written on its faces). You are to call Even or Odd. And if the product of the two showing numbers is even or odd, you get your iPAD accordingly. What would you call?
Even
200
I collect all numbers 1 to 100. I give these numbers randomly to 4 people. Some may get more numbers than the others. I then added the numbers everyone got. The sum for all 4 people were the same.
I made a mistake
300
What is 10+11+12+....+100
5005
300
It takes 1 cent to write any number other than a 0. It costs 2 cents to write a 0. How much will it cost to write down all two digit numbers?
189 cents
300
(1-(1/2))*(1-(1/3))*....*(1-(1/100))
1/100
300
I two two fair dice (each with numbers 1 to 6 written on its faces). What are the chances of getting a prize if the sum of the two numbers is greater than the product?
11/36
300
I collect all numbers 1 to 17. I give these numbers randomly to 4 people. Some may get more numbers than the others. I then added the numbers everyone got. The sum for all 4 people were the same.
It is possible
400
13 odd numbers are taking and to that 13 even numbers are added. The result is divided by 2. What is the remainder?
1
400
I take all odd 2-digit numbers that are made up of only odd digits. I then replace the units place of every number I collected with a 0. What is the sum of all the numbers I have after the change?
25*5=125
400
X+X+1/3=2. What is X
5/6
400
I two two fair dice (each with numbers 1 to 6 written on its faces). If the product of the two numbers is a perfect square, you win. What are your chances
1/6
400
I multiple all 2-digit numbers that are made up of only odd digits. I multiply them all. The units place is 7.
It has to be 5.
500
What is the smallest number that should be multiplied with 1002 so the answer is divisible by 12?
2
500
I write down all numbers from 1 till 10,000 on the board. I then erase all numbers than contain at least 1 zero. How many numbers are left on the board?
9*9*9*9=6561
500
For a given denominator, I write down all proper fractions whose numerator is less than the denominator. By the time I finish all fractions with denominator as 10, how many fractions have I written down in all? (remember numerator and denominator must be positive whole numbers)
45
500
There is a price in house number 131. John starts from 13 and hops forward one house at a time. You can win the price only if you are in house number 131 and Jon is in house number 130. From what house number will you start?
248
500
Starting from one I multiply all consecutive numbers till the product ends in 6 zeros. What is the minimum number of numbers I multiplied.
1*2*3*...*25