Find the single digit number that must be added for a total of 20. At first, cube models are provided to assist in finding the missing addend. Then, just the equations are given
B. Identify a missing addend to reach a sum of 20 with and without a model of base-10 blocks
C. Solve +/- equations that do not cross a ten based on a number line model
D. Solve +/- equations within 100
E. Model and solve +/- equations across 10 using base-10 blocks
F. Solve +/- equations across 10 (Part 1)
G. Solve +/- equations across 10 (Part 2)
H. Solve +/- equations within 100