This SMARTBOARD lesson is another way to have your kids subitize numbers and use their critical thinking skills. See how quickly your students can look at a visual and transfer it to a number in their head. Then they will need to determine what the missing number is that makes the two equal to the number at the top of the slide. Included in this SMARTBOARD lesson is a full PRINTABLE set of cards from all the slides. Great for use in centers, small groups, distance learning, or hands-on activ