To prepare for subtraction with regrouping ones, practice exchanging a ten for 10 ones using the disk model. Give the creature a certain number of ones disks. If there aren't enough ones disks to give away, then exchange a ten disk for 10 ones disks
A. Represent and solve 2-digit subtraction problems without exchanging using a disk model
B. Subtract 2-digit numbers without exchanging using place value cards to subtract tens and ones separately
C. Solve 2-digit column subtraction without exchanging
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)