Marcie is playing a board game with I friend. She needs 20 points to win.she currently has -10. She want to know the difference between the number of points she needs.
A. Write a subtract problem to represent the situation. Then write the subtraction problem as an addition problem.
B. Model the addition problem on the number line.
C.what is the difference between the number of points she needs to win and the number point she has now.
