You will be given a certain amount of objects to start this activity. A certain amount of them will be placed in 10-frame boxes, and some will not be. You need determine how many objects there are altogether
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
D. Record and solve equations that subtract a round number from 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
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