Examples, solution, and videos to help Grade 3 students learn how to multiply and divide with familiar facts using a letter to represent the unknown.
Common Core Standards: 3.OA.4, 3.OA.5, 3.OA.7, 3.OA.9, 3.OA.1, 3.OA.2, 3.OA.3, 3.OA.6
Twenty-four people line up to use the canoes at the park. Three people are assigned to each canoe.
How many canoes are used?
Note: Students may choose to model either as division or as multiplication. In the Concept Development this problem provides a context for using a letter to represent the unknown.
For this problem, we might choose letter c to help us express that the unknown stands for how many canoes are used in the problem.
How will using a letter to express the unknown value change the way we model and solve?
Problem 1: Use a letter to represent the unknown in multiplication.
Problem 2: Use a letter to represent the unknown in division.
Twenty-one students are grouped in threes to go on a field trip. How many groups of students are there?.
Lesson 3 Homework
Try the free Mathway calculator and
problem solver below to practice various math topics. Try the given examples, or type in your own
problem and check your answer with the step-by-step explanations.
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