This worksheet contains 18 horizontal addition equations. Addends are 2-3 digits, which requires students to carefully "line them up." Some problems require regrouping; some do not. The worksheet could be used for homework, independent math centers, whole group or small group review, etc.
Students choose two different colors and write them on the blanks in the table. After solving each equation in the table, they'll look for the sum in the mystery picture and color it accordingly.
My students are motivated to complete these worksheets, as they are always interested to see what the picture will be!