Find the missing term in an addition or subtraction equation. Each equation has a symbol in place of one of the terms. Find the missing number
B. Solve multi-step missing addend equations
C. Solve for missing addends in paired equations (Level 1)
D. Solve for missing addends in a set of three equations
E. Solve for missing addends in paired equations (Level 2)
F. Solve missing addend equations containing a 0
G. Solve for missing addends in paired equations containing a 0