Numbers

Finish this sequence top to bottom...

Riddle:

Look at this sequence from top to bottom. What is the next number in the sequence? 1 11 21 1211 111221 312211 ?
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Make 7 Even

Riddle:

How do you make 7 even?
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Plus vs. Times

Riddle:

Given two 2s, "plus" can be changed to "times" without changing the results: 2 + 2= 2 x 2. The solution with three numbers is easy too: 1 + 2 + 3= 1 x 2 x 3. Now find the answer for 4 numbers and for 5 numbers.
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The Magic Number Pattern

Riddle:

One is to three as three is to five and five is to four and four is the magic number. What is the pattern here?
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