Mathematics - Addition and Subtraction - Subtraction within 20 - Subtract from Ten-Frame
Show two ten-frames with a total of 11-20 counters (e.g., 14 = full ten-frame + 4 in second frame). Problem: 14-6. The student clicks on counters to remove them (they disappear with animation). They discover: first remove 4 from the ones frame, then 2 more from the tens frame. Counter shows remainin