Finding missing addends is one of the most difficult math skills to teach in first grade. These practice worksheets with help students with scaffolded finger images to build their mental math skills. Students will recognize the total number of fingers shown as the sum and color the first addend, then determine the missing addend. Pages 4-5 remove the scaffold of the correct number of fingers to start with. This strategy will help students move away from concrete manipulatives and begin to use th