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.
Legal Size Folder. A legal size file folder folded at the primary score line shall measure 8 5/8 inches in height (for the front flap), 9 5/8 inches in height (for the back flap), and 14 3/4 inches in width. The allowable variation for each dimension shall be plus or minus 1/16 inch. Score Lines on the Front Flap.