Subtracting a round number to other two digit numbers will be the main focus of this exercise. You will model these addition equations using base 10 number cubes
A. Solve equations by adding or subtracting 10 to or from a round number
B. Add and subtract round numbers with and without a model of base-10 blocks
C. Record and solve equations that add a round number to a 2-digit number based on a model of base-10 blocks
E. Model and solve equations that add a round number to a 2-digit number using base-10 blocks
F. Model and solve equations that add two 2-digit numbers using base-10 blocks
G. Model and solve equations that add two 2-digit numbers using base-10 blocks
H. Model and solve equations that add two 2-digit numbers using base-10 blocks
I. Add across 10 using a ten-frame (within 100)
J. Model and solve 2-digit addition equations with and without exchanging using base-10 blocks
K. Model and solve 2-digit addition equations with and without exchanging using base-10 blocks
L. Solve 2-digit addition equations with and without exchanging by adding tens and ones separately