# Operations & Algebraic Thinking – 3rd Grade

#### Represent and solve problems involving multiplication and division.

CCSS.Math.Content.3.OA.A.3
Use multiplication and division within 100 to solve word problems in situations involving equal groups, arrays, and measurement quantities, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.

Teacher Notes
Drawings and equations help us solve word problems in situations involving equal groups, arrays, and measurement quantities.
Understanding the context and actions of a story problem helps us to interpret and represent mathematical equations.

Student Knowledge Goals

I understand multiplication and division.
I can tell what the numbers in a word problem represent.
I know how multiplication and division are related.
I know strategies for solving multiplication and division situations.
I can use and interpret symbols for unknown numbers in multiplication and division equations.
I understand the structure of multiplication and division situations to provide a context for the problem.
I can use the structure of a word problem to help me solve it.
I can write an equation and create a model to describe the context of a multiplication and/or a division problem.

Vocabulary

multiplication equation
multiplication
array
equal groups/shares
factors
products
division equation
division
sharing
dividend
divisor
quotient
unknown/symbol

Lessons
Engage NY Module 1 B-4 – Understand the meaning of the unknown as the size of the group in division.
Engage NY Module 1 B-5 –  Understand the meaning of the unknown as the number of groups in division.
Engage NY Module 1 B-6 – Interpret the unknown in division using the array model.
Learn Zillion Lesson – Relate multiplication and division to the array model using equal groups.

Student Video Lessons
Learn Zillion – Interpreting whole-number quotients of whole numbers
Virtual Nerd – Interpret whole-number quotients of whole numbers
Study Jams – Relate multiplication and division

Online Problems and Assessments
Khan Academy – Questions and Video Lessons
Division word problems – facts to 10
Complete the division table