There are 8 Ounces in a cup. Therefore the Tablespoon is 1/2 Ounce. A teaspoon is 1/3 of a tablespoon or 1/6 of an ounce. Remember this, 128 ounces in a gallon. 1/2 of a gallon is the next stop down = 64. 1/2 of that is a quart = 32 ounces. 1/2 of that is a pint = 16 ounces.
The difference between US Letter and Legal Paper sizes and international A4 is discussed here, however it is important to say that Letter is effectively the equivalent to A4 size in the USA.
PowerPoint presentation set up to print on legal size paper is scaling to letter size. I have a powerpoint presentation that I created using a custom page size - 13w x 7.5h landscape, in anticipation of printing presentation that will be output on legal-size paper. When printed, I am successful at printing on legal size paper, however the presentation is scaled for letter size paper.