Option 1: You can make 50 small blocks from 1 big sheet at once. This is good if you always cut 50 blocks at a time.
Option 2: You can cut 1 small block at a time and use 0.02 of a big sheet for each. This is good if you cut different numbers of blocks.
Choose Option 1 if you want to make all 50 blocks in one go, and Option 2 if you need more flexibility.