Practice a strategy for subtracting two two-digit numbers. Break the second number into tens and ones, then subtract the tens from the first number, and finally subtract the ones from the first number. No regrouping is required for these problems
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
K. Subtract 2-digit numbers with and without using place value cards to subtract tens and ones separately
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