This PowerPoint slideshow is fully-animated. Just click and go. Five minutes long for a quick math warm-up for subtracting within 20. Students have six seconds to solve a problem, and then the answer pops up. Immediate feedback! 40 problems and their answers as students subtract from 10 (10-6, 10-3…), from the teens (18-7, 19-4…), and from 20 (20-5, 20-12…).
This slideshow is perfect for a warm-up before your whole-class math lesson. Or, use it at the end so that you can do “teacher stuff” while your students solve 40 problems. Or, you can place it on student-computers for independent review as a Math Center.
Take a look at the Preview to see some of the slides in this slideshow.
If you would like more subtraction, here are the others in this series:
Subtraction Warm-up in Five Minutes: subtract within 20
Subtraction Warm-up in Five Minutes: subtract within 100
Subtraction Warm-up in Five Minutes: subtract within 1000