Our self-checking, interactive Subtraction Practice Board provides independent, tactile subtraction practice for facts up to 17-9. Students solve each subtraction problem and then spin the dial to check their answers. When they're done, they simply raise the handles on the sides to reset the dials and practice again! What’s Included: Subtraction Practice Board Activity guide Features SUBTRACTION BOARD: Solve! Check! Repeat! Enjoy independent, tactile subtraction practice with our self-checking Subtraction Math Facts Board. SELF-CORRECTING NUMBER TOYS: Children will complete subtraction problems and spin the dials to check their answers. Simply raise the handles on the sides to reset the dials and play again. KIDS LEARNING TOYS: Practice 81 subtraction equations with this self-checking skills practice board! Designed with 9 rows and 9 columns of equations. MATH CENTERS KINDERGARTEN: Perfect for on-the-go math skills practice and independent learning! Details Brand hand2mind Grade Level K, 1, 2 Piece Count 1 Batteries Needed No Dimensions(L x W x H) 1.75" x 8.5" x 8.25"