Puzzles

How many different grid paper rectangles can you create (and colour) that satisfy these puzzle conditions?

Frac-tangle #1:

This rectangle is 1/2 blue and 1/4 yellow. The rest of the rectangle is black.

Frac-tangle #2:

This rectangle is made of 12 total squares. Three of these squares are green. One-fourth of them are red. One-sixth of them are yellow, and the rest are blue.

Frac-tangle #3:

This rectangle is 3/8 blue and 1/4 yellow. The rest of the rectangle is red.

Frac-tangle #4:

This rectangle is 3/5 red. The rest is blue and yellow, but not in equal amounts.