At the mall, Leona bought a T-shirt and a book for a total of $23. The book cost $12. How much did the T-shirt cost?

What is the unknown information?

Let x represent the unknown information. Write an addition equation that models the problem

Solve the equation.

Answer the question.

2 answers

12 + x = 23
So, what do you think?
23-12 = cost of t-shirt.

x+12 = 23.