Unknown Addends (to 20): Count the Blank Boxes

By filling in the blank squares, learners complete five addition number sentences both visually and numerically. For each problem, a frame is filled with a certain number of images (turkeys, candles, etc.) and a certain number of blank boxes. They count the blanks and fill in the missing addend in each number sentence. Note the instructions direct students to "count the blank box" instead of boxes.