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Mathematics Final Exam of Grade Five in Primary School (Nankai District)
1.5 still count? ! ! !

Shadow is divided into upper left (1), upper right (2), lower left (3) and lower right (4) blocks by four long squares.

4 Move to the bottom of 3 and fill the gap 1+3+4= half of two long squares, that is, 1. Plus the remaining 2 is half of the square, which is 0.5.