Subtract a three-digit multiple of 100 from a three-digit multiple of 10, first using the disk model, and then without the model. See that subtracting a multiple of 100 from another three digit number means subtracting the hundreds digits
A. Add and subtract 3-digit numbers with no tens or ones
B. Add 3-digit round numbers with and without using a disk model
D. Add a 2-digit round number to a 3-digit round number by adding hundreds, tens, then ones
E. Add up to the next hundred with and without using a number line model
F. Add a 2-digit number to a 3-digit number using the "Make the Next Hundred" strategy (Part 1)
G. Add a 2-digit number to a 3-digit number using the "Make the Next Hundred" strategy (Part 2)
H. Add a 2-digit round number to a 3-digit round number using mental math
I. Subtract a 2-digit round number from a 3-digit round number by subtracting hundreds, tens, then ones
J. Subtract to the next hundred with and without using a number line model
K. Subtract a 2-digit number from a 3-digit number using the "Make the Previous Hundred" strategy (Part 1)
L. Subtract a 2-digit number from a 3-digit number using the "Make the Previous Hundred" strategy (Part 2)
M. Subtract a 2-digit round number from a 3-digit round number using mental math
N. Break a 3-digit number into hundreds and a 2-digit number
O. Add 3-digit numbers by adding on the hundreds first
P. Add 3-digit numbers using mental math
Q. Add 3-digit numbers with exchanging by adding on the hundreds first
R. Add 3-digit numbers with exchanging using mental math
S. Subtract 3-digit numbers by subtracting the hundreds first
T. Subtract 3-digit numbers using mental math
U. Subtract 3-digit numbers with exchanging by subtracting the hundreds first
V. Subtract 3-digit numbers with exchanging using mental math