Students will break down a number being subtracted using a number bond. Models involve breaking down the original problem into one equation that makes 10, then a second subtracting from 10 to solve for the total difference
A. Solve subtraction problems taking from 10
B. Subtract single digits from numbers 11-19 to make 10
C. Subtract the digit in the ones place from numbers 11-19 to make 10
D. Find the unknown number in subtraction problems to make 10
E. Solve subtraction problems beginning with a number from 11-15 and crossing 10
F. Use the strategy of making 10 to solve subtraction equations
G. Introduce subtraction across 10 using base-ten blocks
H. Model subtraction across 10 using base-ten blocks and knowledge of number bonds
I. More practice subtracting across 10 with base-ten blocks
K. Use number bonds to break down components of subtraction equations; use one equation to solve
L. Solve subtraction equations by using the strategy of making 10
M. Solve subtraction equations that cross 10