Designed to jump-start math fluency, our part-whole cards help kids visualize addition and subtraction problems! Each card features a kid-friendly bar model with a question mark representing the missing value. After children solve for the missing number, they simply flip the card over to check their answer! Perfect for small groups, math centers and independent practice, the set includes 100 double-sided cards in a sturdy box with tabbed dividers. Cards measure 4" x 6".