Answer:

3 x 6 = 18

Teacher Notes:

Students in grades 3–5 can model a variety of situations, including geometric patterns, real-world situations, and scientific experiments. Sometimes they will use their model to predict the next element in a pattern. At other times, they may make a general statement about how one variable is related to another variable: for example, if a sandwich costs $3, you can figure out how much any number of sandwiches costs by multiplying that number by 3. In modeling situations that involve real-world data, students need to know that their predictions may not always match the observed outcomes for a variety of different reasons. Students should also begin to understand that different models for the same situation can give the same results.6

6 National Council of Teachers of Mathematics. (2000). Principles and standards for school mathematics (pp. 162–163). Reston, VA: Author.