 # Lesson Plan: Stars Subject:  Math

Lesson Objective: To use addition and subtraction to solve word problems

Common Core Standard:  CCSS.MATH.CONTENT.2.OA.A.1- Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.

Materials:

Starter:

Say:

• Why do we use addition and subtraction?  (Allow the students to answer.)

Main:

Say:

• Addition is used when putting objects together and trying to figure out how many total objects there are.  Subtraction is used when taking objects away and trying to figure how many objects are left.
• Today you are going to be solving word problems using addition and subtraction.
• When you are solving word problems, what are some of the key words to look for?  (Allow the students to answer)
• Some of the key words that might be used in words problems that use addition are add, all together, both, combined and sum.
• Some of the key words that might be used in word problems that use subtraction are as fewer, difference, take away and minus.
• To solve a word problem, you first need to understand the situation that is being described.
• Then, you need to figure out what you are supposed to be solving.  You can do this by drawing a picture or writing an equation or word sentence with a circle where the missing information would go.
• Now, you are going to be doing some word problems.  All of the word problems will use either addition or subtraction.  When you are done, we will go over all of the answers.
• Does anyone have any questions?

Feedback:

Say:

• Who would like to share your answers?  (Allow the students to share.)

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Written by Kimberly Greacen, Education World® Contributing Writer

Kimberly is an educator with extensive experience in curriculum writing and developing instructional materials to align with Common Core State Standards and Bloom's Taxonomy.