Mathematics - Number Sense - Counting - Counting objects 11-20 - Ten and Some More
Show a ten-frame (2x5 grid) that is completely filled with 10 counters, plus extra counters beside it. The student sees that 13 = a full ten-frame + 3 more. Let them click arrows to add/remove counters from 11 to 20. Each time, the display shows: the ten-frame, the extras, and the numeral. A sentenc