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Contestant Information
(This question is mandatory)
Username - Do not Use Your Real Name
Please enter a username that you will use for online Math Challengers work.  You can create a new username if you want to start again fresh - it's up to you.   You can also  have more than one username if you want to as well.  Be sure to remember it somehow.  If you want to change your Username, enter your new Username here and enter your old Username and Secret Code in the questions at the end.  If you use someone else's existing  Username then we will add up to four characters of your Secret Code to the end of your Username to make yours unique.  If it takes more than four characters we will assume that you just made a mistake entering your Secret Code and disqualify the entry.  We will publish your Username with your results.
(This question is mandatory)
Your (Hard to Guess) Secret Code. 
Enter a number between 10000000 and 99999999. This is what we will use to keep others from using your Username.  Enter an 8 digit number between 10000000 and 99999999.  Using a number that DOES NOT CONTAIN AN OBVIOUS PATTERN OR REPEATING DIGITS will prevent others from guessing your secret code IF WE HAVE TO PUBLISH THE FIRST FEW DIGITS (see Help under Username). If you want to change your secret code, enter your new code here, and enter your Username and old Secret Code in the questions at the end. We will not publish your Secret Code.
(This question is mandatory)
Grade Level
This is the Math Challengers grade level you are writing in.  Usually this is the grade you are attending in school, but not always.  Please see the Math Challengers Rules page for more information. At this time, Math Challengers only provides formal competitions for grades 8, 9, and 10, but everyone is welcome to participate in this Online Quiz.  We will publish your Grade Level.
(This question is mandatory)
What is your Math Challengers Region?
We will not publish your Math Challengers Region.
(This question is mandatory)
Did you work on this quiz as a team or individual?
We will publish your answer to this question.
Question Group 1
1.  A water tank is 1/8 full. When 15 gallons of water are added to the tank, the tank is 3/4 full. How many more gallons of water is needed to fill the tank?
Enter a number with the format:  -999.999 to 999.999.  We will publish whether or not you got this answer correct.
2. When  four fair, six sided dice are rolled there are 64  possible outcomes. In how many ways can the dice be rolled so that the sum of the numbers rolled is multiple of 10?
Enter a number with the format:  -999.999 to 999.999.   We will publish whether or not you got this answer correct.
3.  How many positive natural numbers  are less than or equal to 64 and relatively prime with 64?  Two numbers a and b are said to be relatively prime if their greatest common divisor is 1.
Enter a number with the format:  -999.999 to 999.999.   We will publish whether or not you got this answer correct.
4.  Using the digists 1,3,4,6 and 7, exactly once, create the largest odd number that is divisible by 3.
Enter an integer  -9999999 to 9999999   We will publish whether or not you got this answer correct.
5.  How many integers are between 101 and 1001 (including 101 and 1001) are divisible by 11?
Enter a number with the format:  -999.999 to 999.999.   We will publish whether or not you got this answer correct.
6.  The arithmetic mean of three numbers is 133. If the mean of the first two numbers is 126. What is the third number?
Enter a number with the format:  -999.999 to 999.999.   We will publish whether or not you got this answer correct.
7.  Find the remainder when 2^495 is divided by 11.
Enter a number with the format:  -999.999 to 999.999.   We will publish whether or not you got this answer correct.
8.  What is the greatest whole number that must be a factor of the sum of any four consecutive positive odd numbers?
Enter a number with the format:  -999.999 to 999.999.   We will publish whether or not you got this answer correct.
9.  Find the smallest positive integer that is divisible by 17, and when divided by any integers from 2 to 16 (both inclusive) leaves a remainder of 1.
Enter an integer  -9999999 to 9999999.   We will publish whether or not you got this answer correct.
10.  Write the binary number 101010101010 in a decimal form.
Enter an integer  -9999999 to 9999999.   We will publish whether or not you got this answer correct.
Summary Questions
(This question is mandatory)
How much help did you get?
Help can come from many sources:  someone else, the Internet, a textbook, etc.  We will publish your answer to this question.
(This question is mandatory)
How much did you like this online quiz?
We will not publish your answer to this question.
Comments?
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Old Username.
If you want to change your Username, enter your new username at the beginning of this quiz, and enter the one you have been using here.  We will not publish that you have changed your Username.
Old Secret Code
If you want to change your Secret Code, enter your new Secret Code at the beginning of this quiz, and your Secret Code you have been using here.  We will not publish that you have changed your Secret Code.