Here's some number problems.
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First number is the cube of the second
Take the $n$th prime where $n$ is the position in the alphabet of the letter and square it (i.e, $A=2^2, B=3^2, C=5^2,\ldots$)
Take the sum of the digits. If it's a square, then SQUARE. Otherwise, if it's a cube then CUBE. 2+1+6=9 which is a SQUARE.
Fourth one (spotted by @Stiv)
Each letter is the first letter of a month with 31 days and the number is its position in the calendar. Since May has appeared already, the next must be March, which is the 3rd month.