A fun Halloween themed math activity for your class! Students watch a PowerPoint presentation, on your interactive white board, which shows addition problems (up to 100 with regrouping.) Students solve each addition problem and color in the answer on the accompanying 100 grid. PowerPoint is set to run automatically at 15 seconds per slide. You can adjust the timing to give your students more or less time for each problem. Student directions are on the first slide. Students will need two color pencils/crayons/markers for this activity - black and orange. If the addition problem is on a black background, color the answer black. If the addition problem is on an orange background, color the answer orange. Answer sheet is included! The correct answers will spell out "Boo!" on the 100 grid.