Adding and subtracting round numbers will be the focus of this activity. You will have the use of base 10 number cubes to assist with some problems, but some of the problems will not allow for the use of those cubes
A. Solve equations by adding or subtracting 10 to or from a round number
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
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