Embedded Files
Lesson 1: Strategies for Adding and Subtracting within 100
Lesson Overview: This lesson will cover adding and subtracting within 100 using strategies on paper. It will begin with a video explanation of strategies and reinforced through modeling on the board in a Google slideshow presentation. Students will be grouped based on the results from the pre-test. Students will break into pairs to work on a worksheet that requires the use of the strategies. The students who struggled on the prerequisite skills on the pre-test will be placed into groups to work closely with Mrs. Davis and Mrs. Castro as Ms. Bergeron walks around to the pairs. At the end, students will recognize the strategies introduced and will work to begin to use them when adding and subtracting within 100.
Essential Questions:
How can we add and subtract within 100?
Why do we need to use strategies when adding larger numbers?
Vocabulary
Place Value: the value of each digit in a number
Sum: the total or whole amount (addition)
Difference: result of subtracting one number from another (subtraction)
Break Apart: breaking apart 2-digit numbers into tens and ones.
Open Number Line: visual representation of moving backwards and forwards (add and subtract)
Uni-Fix Cubes: plastic math manipulative
Base Ten: represent numbers as a base-ten model
Standards
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 with a symbol for the unknown number to represent the
problem.
2NBT.5 Use place value understanding and properties of operations to add and subtract.
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Learning Outcomes
Explain why inventors need to be able to fluently add and subtract within 100.
Use strategies based on place value, properties of operations, to add and subtract within 100 (two-digit and one-digit).
The second-grade students will develop the ability to use a strategy on paper (Open Number Line, Place Value, Break Apart, Base-Ten Blocks), to solve addition and subtraction problems within 100.
Lesson 2: Solving One-Step Word Problems
Lesson Overview: This lesson will cover how to solve one-step word problems by adding and subtracting within 100 as well as touching on/introducing the concept of solving two-step word problems. The lesson will begin by reviewing the four strategies for adding and subtracting within 100 that Hannah covered in lesson one last week. Next, we will discuss the importance of word problems. I will discuss how they may seem intimidating but help us connect the math that we learn in school to real-world situations. To emphasize this point I will have students act out a word problem. This lesson will put a lot of emphasis on how to know when to add and how to know when to subtract when solving a word problem. This point will be taught by focusing on the keywords and phrases to look for when reading a word problem. A Kahoot has been included to help the students remember the words/phrases and assess the student’s understanding of this topic. Students will be taught to dissect word problems by circling important numbers, putting a box around keywords and phrases that tell them whether they should add or subtract, and underlining the question they are being asked. Next, they will learn to set up an equation to solve the word problem by using the information they pulled from the word problem. Then they will be taught to check that they answered the question being asked and label their answer. To practice this skill and make a connection to the theme of inventors students will be given a blueprint and some word problems that correspond to the blueprint. The students will need to use the information provided in the blueprint to answer the questions.
Essential Questions:
How do we use addition and subtraction strategies to solve one and two-step word problems?
Why do inventors need to know how to use addition and subtraction strategies to solve one and two-step word problems?
Vocabulary
Addition: finding the total value of two or more numbers
Subtraction: the process or skill of taking one number or amount away from another
Operation: mathematical process or activity used to solve problems
Sum: the result of adding two or more numbers or terms together
Difference: the result of subtracting one number from another
Equation: shows the relationship of equality between the expression written on the left side with the expression written on the right side
Standards
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 with a symbol for the unknown number to represent the
problem.
2NBT.5 Use place value understanding and properties of operations to add and subtract.
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Learning Outcomes
Understand why it is important for inventors to be able to solve one and two-step word problems by adding and subtracting within 100.
Apply the strategies that they learned in lesson one for adding and subtracting within 100.
Dissect a word problem and determine the equation that needs to be used to solve for the answer.
Lesson 3: Invention Convention!
Lesson Overview: To begin, for about 10 minutes students will be reminded of ‘why’ having a strategy for adding and subtracting is important through a Google slide paired with a discussion. Then, students will be grouped based on their grade on the pre-assessment. There will be five centers around the room, three centers will be teacher-guided and two independent-work. Each group will spend ten minutes at each and rotate to the next station until all stations are completed by each student. Each station will consist of a different strategy for adding and subtracting within 100. One station will have a worksheet that asks students to explore and write why having a strategy is important to them as students and as an inventor. During this lesson, students will have access to uni-fix cubes, number lines, base ten blocks, and other resources to help support them.
Essential Questions:
How can we add and subtract within 100?
Why do we need to use strategies when adding larger numbers?
Vocabulary
Place Value: the value of each digit in a number
Sum: the total or whole amount (addition)
Difference: result of subtracting one number from another (subtraction)
Break Apart: breaking apart 2-digit numbers into tens and ones.
Open Number Line: visual representation of moving backwards and forwards (add and subtract)
Uni-Fix Cubes: plastic math manipulative
Base Ten: represent numbers as a base-ten model.
Standards
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 with a symbol for the unknown number to represent the
problem.
2NBT.5 Use place value understanding and properties of operations to add and subtract.
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Learning Outcomes
Explain why inventors need to be able to fluently add and subtract within 100.
Use strategies based on place value, and properties of operations, to add and subtract within 100 (two-digit and one-digit).
The second-grade students will develop the ability to use a strategy on paper (Open Number Line, Place Value, Break Apart, Base-Ten Blocks), to solve addition and subtraction problems within 100.
Lesson 4: Let's Review
Lesson Overview: This lesson will be review-focused. This unit has covered the strategies used to add and subtract two two-digit numbers within 100. The strategies covered were place value, base ten, break apart, and number line. To review these strategies each student will be given a review sheet with a fun coloring activity at the end related to the theme. In this activity, the students will practice using each strategy while also determining which strategy they are most comfortable with. Once we have reviewed the strategies, we will move on to word problems. We will cover word problems with a few games and a brief worksheet. To conclude the lesson students will participate in a turn and talk to discuss why inventors need to use these skills. Finally, students will take the post-assessment.
Essential Questions:
How do we use addition and subtraction strategies to solve one and two-step word problems?
Why do inventors need to know how to use addition and subtraction strategies to solve one and two-step word problems?
Vocabulary:
Place Value: the value of each digit in a number
Sum: the total or whole amount (addition)
Difference: result of subtracting one number from another (subtraction)
Break Apart: breaking apart 2-digit numbers into tens and ones.
Open Number Line: a visual representation of moving backward and forwards (add and subtract)
Uni-Fix Cubes: plastic math manipulative
Base Ten: represent numbers as a base-ten model.
Equation: shows the relationship of equality between the expression written on the left side with the expression written on the right side
Operation: mathematical process or activity used to solve problems
Standards:
1.OA.A.1 Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using
objects, drawings, and equations (number sentences) with a symbol for the unknown number to
represent the problem
1.NBT.C.4 Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings, and strategies based on place value,
properties of operations, and/or the relationship between addition and subtraction; relate the strategy
to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one
adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
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 with a symbol for the unknown number to represent the
problem.
2NBT.5 Use place value understanding and properties of operations to add and subtract.
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Learning Outcomes:
Understand why it is important for inventors to be able to solve one and two-step word problems by adding and subtracting within 100.
Apply the strategies that they learned in lesson one for adding and subtracting within 100.
Dissect a word problem and determine the equation that needs to be used to solve for the answer.
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