In second grade, students learn the basic concepts of addition, and one of the methods used to teach this is through the use of 10 frames. A 10 frame is a rectangular box divided into 10 smaller squares, and each square can be filled in with a counter or a number to represent a quantity.

By using 10 frames, students can visually see how numbers can be combined to form a new quantity. For example, if a 10 frame is completely filled with counters, it represents the number 10. If another 2 counters are added, the students can see that the new quantity is 12.

This helps students build a strong foundation in basic math skills, which can be applied to more complex mathematical concepts as they progress through their education.