Subtract two-digit numbers by first breaking the numbers into tens and ones. The first few problems provide steps for using this strategy, and the last few problems allow you to practice the strategy on your own
A. Relate 1 more or less and 10 more or less to addition and subtraction (Part 1)
B. Relate 1 more or less and 10 more or less to addition and subtraction (Part 2)
C. Identify the rule for a +/- 1 or 10 counting pattern and continue the pattern (Part 1)
D. Identify the rule for a +/- 1 or 10 counting pattern and continue the pattern (Part 2)
E. Record a 2-digit number as tens and ones
F. Add a round number to a 2-digit number with and without using number bonds to add tens first
G. Subtract a round number from a 2-digit number with and without using number bonds to subtract tens first
H. Add and subtract 2-digit and round numbers including turnaround facts
I. Add 2-digit numbers using place value cards to add tens and ones separately
J. Add 2-digit numbers with and without using number bonds to add on the tens first
L. Subtract 2-digit numbers with and without using number bonds to subtract the tens first
M. Add 2-digit numbers with and without exchanging using place value cards
N. Add 2-digit numbers with exchanging and without using number bonds
O. Subtract 2-digit numbers with exchanging with and without using number bonds