Add or subtract across 10. Represent the numbers with cubes. For a sum, fill one tens rod and move the leftover ones. Enter the sum. For a difference, pop the subtracted cubes and enter the difference
A. Identify a missing single-digit addend to reach the next round number with and without a model of base-10 blocks
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
F. Solve +/- equations across 10 (Part 1)
G. Solve +/- equations across 10 (Part 2)
H. Solve +/- equations within 100