Students break a 2-digit addition equation into two separate equations--one adding ones to ones, and another adding tens to tens. Students then add the sums together to find the total sum
A. Add tens numbers (Level 1)
B. Add tens numbers (Level 2)
C. Subtract tens numbers (Level 1)
D. Subtract tens numbers (Level 2)
E. Solve addition problems with 2-digit numbers and tens numbers (Level 1)
F. Solve addition problems with 2-digit numbers and tens numbers (Level 2)
G. Solve addition problems with two 2-digit numbers (Level 1)
I. Solve addition problems with two 2-digit numbers (Level 3)
J. Solve addition problems with two 2-digit numbers, including regrouping