You will calculate the difference of subtraction equations in this activity. Each equation involves subtraction single digit numbers from two digit numbers
A. Solve substraction equations that include the number 10
B. Complete equations that add or subtract all tens or all ones with and without a model of base-10 blocks
C. Add ones to numbers in the second ten using base-10 blocks
D. Subtract from numbers 11-20 using base-10 blocks