The ornamental design for a choppingboard, as shown and described.
FIG. 1 is a front elevation view of the chopping board;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a right side elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a perspective view thereof; and,
FIG. 8 is an enlarged perspective view of a bottom right corner thereof.
The evenly-dashed broken lines illustrate portions of the chopping board that form no part of the claimed design. The dot-dash broken lines illustrate boundaries of the claimed portion of the chopping board, and do not form a part of the claimed design.