The ornamental design for a multiplication teaching board game, as shown and described. The indicia shown on the figures are for illustrative purposes only and are hereby disclaimed as forming no part of Applicant's claimed invention.
FIG. 1 is a front elevational view of a multiplication teaching board game showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a side elevational view thereof; and,
FIG. 4 is a top plan view thereof.
The broken line showing of a game piece is for illustrative purposes only and forms no part of the claimed design.