You will be adding and subtracting 10 from round numbers in 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
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
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