Like in the previous page, were looking for a missing number. However, the procedure is similar, but different. The first card gives the clue.
Clue card. Cube the top number, then subtract the bottom right. ?=434
Top left: 1, Bottom right: 51
Top left: 266, Bottom right: 212
Top left: 76, Bottom right: 7
Top left: 3, Bottom right: 8
Top left: 455, Bottom right:34