Jason completed today's daily review questions on skip counting by 5s, 2-digit addition, a subtraction word problem, telling time to the half-hour, and shape names. Our lesson used connecting cubes and a number bonds recording sheet to help understand the relationship between addition and subtraction. Jason chose the total amount of cubes to use for each problem and the 2 parts each whole was broken into. These amounts were written into a part-part whole model along with its correlating 2 addition and 2 subtraction equations. Then, Jason determined the unknown number or missing part of shown part-part whole problems. Finally, this strategy was used to help answer subtraction within 20 fact fluency questions.