Subtract two-digit numbers without regrouping by breaking them apart into tens and ones, and subtracting the tens and ones separately. Then combine the remaining tens and ones to form the answer
A. Represent and solve 2-digit subtraction problems without exchanging using a disk model
C. Solve 2-digit column subtraction without exchanging
D. Exchange a ten for ones using a disk model
E. Subtract 2-digit numbers with exchanging using a disk model
F. Subtract 2-digit numbers with exchanging using place value cards
G. Solve 2-digit column subtraction with exchanging using a disk model
H. Solve 2-digit column subtraction with exchanging (Level 1)
I. Solve 2-digit column subtraction with exchanging (Level 2)
J. Solve 2-digit column subtraction with and without exchanging
K. Solve 2- and 3-digit column subtraction with and without exchanging ones (Level 1)
L. Solve 2- and 3-digit column subtraction with and without exchanging ones (Level 2)