☘ A slide show will guide students to create the mystery picture on the 100 chart, and it's self-checking on each slide! Students have to know 10 more 10 less 1 more 1 less. Give yourself a chance to do some prep, mini assessments, or whatever you need to do for about 15 minutes as student have fun, are engaged and reviewing math!☘ What's included: timed slide show, which includes a slide for each of these--hundred chart page for students, teacher "read this first" directions, sample slide to te