Tuesday, August 24, 2010
6th - 12th grade
Factorial (!) means to multiply by every positive number equal to or lower than the given number. For example, 5! 5x4x3x2x1=120.
Calculate 10!
Calculate 10!
Tuesday, October 27, 2009
4th thru 7th Grade
There are two different ways of making one
dollar using 11 coins, which must be quarters,
dimes and nickels, with at least one of each.
What are these two ways?
dollar using 11 coins, which must be quarters,
dimes and nickels, with at least one of each.
What are these two ways?
7th Grade
The sum of 5 numbers is odd. Which of the followings statements must be true?
a) There are an odd number of even numbers.
b) There is an even number of odd numbers.
c) There are an odd number of odd numbers.
d) There are no even numbers.
a) There are an odd number of even numbers.
b) There is an even number of odd numbers.
c) There are an odd number of odd numbers.
d) There are no even numbers.
7th Grade
A digital clock shows either 3 digits of 4 digits at a time.
What time it when the digits have their greatest sum?
What time it when the digits have their greatest sum?
Tuesday, September 8, 2009
5th - 8th grade
Bill has 7 students in his basketball team. Only 5 can play at once. How many different groups of 5 students can have on the court at a time?
Hint: it's easier to think of the reverse of this questions - how many different groups of 2 students can sit on the bench.
Hint: it's easier to think of the reverse of this questions - how many different groups of 2 students can sit on the bench.
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