This calculator can add subtract or multiply:
30 frames per second VIDEO
25 frames per second VIDEO (called the PAL Standard)
24 frames per second FILM.

ADDITION and SUBTRACTION are rather straightforward.
Click ADD or SUBTRACT and then enter the appropriate data in the first2 rows.
Click CALCULATE and row 3 displays the answer.

MULTIPLYING is not that difficult either. Just remember to use the upper left box for inputting the multiplication factor and then enter data on the first input line. Anything input on the second line has NO bearing on this calculation. Click CALCULATE for the answer.

This calculator is quite versatile. Here's one interesting example. Suppose you wanted to know the value of 10000 video frames. Click ADD then enter 10000 in the frames column. Click CALCULATE and look at the result. Rather neat huh?

Good luck calculating !!!