Check out this video to see the chip model used to add two and three digit numbers:
https://www.engageny.org/resource/grade-2-math-using-chip-models-two-and-three-digit-addend-addition-and-subtraction
https://www.engageny.org/resource/grade-2-math-using-chip-models-two-and-three-digit-addend-addition-and-subtraction