Pairs: 3+7, 4+6

Place 3 counters on a ten-frame. Count the empty spots: 7. So 3 plus 7 equals 10. Here is a fun way to remember: a week has 7 days. If 3 days have passed, there are 7 days left to make a full 10-day period? Well, not quite — but 3 and 7 are partners that always make 10!