Add two whole numbers with sums up to 100 with procedural reliability. Subtract a whole number from a whole number, each no larger than 100, with procedural reliability.
The sum 41+23 can be found by using a number line and “jumping up” by two tens and then by three ones to “land” at 64.
Instruction focuses on helping a student choose a method they can use reliably.
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Trip to Statue of Liberty | Students will discuss facts about the Statue of Liberty and take a virtual tour. Students will use tables of ferry ticket and food prices to solve one and two-step word problems involving money. |
COUNTING ON RESPONSIBLE CITIZENSHIP (Lesson 3 of 3) | In this math/civics lesson integrated lesson students will create a pictograph based on data collected from 3 short stories realted to ressponisble and irrsponsible citizenship.
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Fundraising on a Budget | This Model-Eliciting Activity (MEA) is designed for a second grade level. Students will be working in small groups to figure out what companies to hire for the art gallery to have a successful charity event. The students will be evaluating criteria such as bands for the event, caterers, and artists. Students will need to add money to stay within a budget. They will write their procedure for making their selections.
Model Eliciting Activities, MEAs, are open-ended, interdisciplinary problem-solving activities that are meant to reveal students’ thinking about the concepts embedded in realistic situations. Click here to learn more about MEAs and how they can transform your classroom. |
Pirate Party! - Let's Make a Ten | This lesson teaches students how to apply the "make-a-ten" strategy to addition problems involving two-digit addends. |
Roll and Add Two Digit Numbers | In this lesson students will use two dice to roll and add two-digit numbers. Students will also use their numbers to create and solve one-step addition word problems. |
Disappearing Tens | Students learn to subtract multiples of ten from multiples of ten by playing a game. |
Carnival | Written at a second grade level, in this MEA the students will use problem solving skills, two-digit addition, and knowledge of greater than and less than to rank order carnival games based on provided criteria. Model Eliciting Activities, MEAs, are open-ended, interdisciplinary problem-solving activities that are meant to reveal students’ thinking about the concepts embedded in realistic situations. Click here to learn more about MEAs and how they can transform your classroom. |
Cookie Contest | This MEA asks students to decide which factors are important in choosing the best cookie in a cookie contest. Students will take on the role of cookie critics to provide feedback to a teacher whose grade level is deciding which cookie to use for a fundraiser. They will rank order their choices from the best to worst cookie. Students will provide a detailed written explanation for how they decided to rank factors and their solution. They will show their work while adding up to 4 two-digit numbers to calculate the total number of votes. Model Eliciting Activities, MEAs, are open-ended, interdisciplinary problem-solving activities that are meant to reveal students’ thinking about the concepts embedded in realistic situations. Click here to learn more about MEAs and how they can transform your classroom. |
Birthday Parties 'R' Us | Students will determine which pizza place should be used to cater parties at the Birthday Parties 'R' Us facility given a set of data. They will create a procedure for determining the best pizza place, write an explanation about their procedure, and present their recommendations to the class. Model Eliciting Activities, MEAs, are open-ended, interdisciplinary problem-solving activities that are meant to reveal students’ thinking about the concepts embedded in realistic situations. Click here to learn more about MEAs and how they can transform your classroom. |
Rip and Regroup to Add | Students will learn how to transpose a horizontal addition equation with two-digit addends using a specialized vertical place value work mat. Students will "rip and regroup" to help understand how to regroup ten ones as one ten and move toward using a standard algorithm for addition. |
Alternative Addition Strategies | This lesson explores various addition strategies of two-digit numbers. The lesson focus is to encourage students to find and develop a reliable method they can use to add within 100. The lesson includes making an Addition Strategies Mini Booklet, which students can keep and use as a reference tool. |
How Many Inches, Feet, and Yards? | Students will measure the length of given objects using various measuring tools. The students will record their measurements using different units including inches, feet, and yards to the nearest whole unit. Students will also estimate and measure the lengths of objects, then compare their estimations to their measurements to find the difference.
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Is it "Most Magically Magical"? | This lesson is intended to be a cooperative inquiry-based activity used close to the end of second grade. The students will be actively engaged in adding and subtracting numbers within 100 while having fun completing Magic Squares. |
Odds and Evens | This resource helps students identify numbers as odd or even using a variety of methods including creating pairs, skip counting by two’s, using number lines, and arrays. It also leads them to understand that all even numbers can be written as a sum of equal addends and odds can be written as the sum of equal addends plus one.
This resource can be conducted as one lesson or can be spread over multiple mini sessions if needed as noted within this resource as Lesson 1 and Lesson 2.
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Success with Story Problems - Addition/Subtraction | In this lesson, students will solve one and two-step real-world problems using a variety of problem-solving strategies. |
Sweet Addition and Subtraction | This lesson is a continuation of the "Sweet Values" and "Sweet Number Places" lessons also found on CPALMS. It is a different way of teaching addition and subtraction, by continuing a story that started with place value. In this lesson, students will learn to use the place value knowledge gained to solve word problems. |
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Subtracting with regrouping | In this tutorial video from Khan Academy, a subtraction problem is solved which contains two numbers each with two-digits. The video demonstrates subtraction with regrouping using the standard algorithm, as well as a method using expanded form. |
Subtracting two-digit numbers without regrouping | In this video tutorial from Khan Academy, explore subtracting two-digit numbers by using the standard algorithm. This video does not include regrouping. |
Adding two-digit numbers without regrouping | In this tutorial video from Khan Academy, explore adding two-digits numbers with base ten blocks and connect this to the standard algorithm. The examples do not include regrouping. |
Understanding place value when subtracting tens | In this video tutorial from Khan Academy, explore the connection between place value and subtraction. This video explains how to solve a subtraction problem with numbers less than one hundred using base ten blocks. |
Understanding place value while adding tens | Learn how to add 23 + 30 by thinking about place value. |
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Description |
Subtracting with regrouping: | In this tutorial video from Khan Academy, a subtraction problem is solved which contains two numbers each with two-digits. The video demonstrates subtraction with regrouping using the standard algorithm, as well as a method using expanded form. |
Subtracting two-digit numbers without regrouping: | In this video tutorial from Khan Academy, explore subtracting two-digit numbers by using the standard algorithm. This video does not include regrouping. |
Adding two-digit numbers without regrouping: | In this tutorial video from Khan Academy, explore adding two-digits numbers with base ten blocks and connect this to the standard algorithm. The examples do not include regrouping. |
Understanding place value when subtracting tens: | In this video tutorial from Khan Academy, explore the connection between place value and subtraction. This video explains how to solve a subtraction problem with numbers less than one hundred using base ten blocks. |
Understanding place value while adding tens: | Learn how to add 23 + 30 by thinking about place value. |
Name |
Description |
Subtracting with regrouping: | In this tutorial video from Khan Academy, a subtraction problem is solved which contains two numbers each with two-digits. The video demonstrates subtraction with regrouping using the standard algorithm, as well as a method using expanded form. |
Subtracting two-digit numbers without regrouping: | In this video tutorial from Khan Academy, explore subtracting two-digit numbers by using the standard algorithm. This video does not include regrouping. |
Adding two-digit numbers without regrouping: | In this tutorial video from Khan Academy, explore adding two-digits numbers with base ten blocks and connect this to the standard algorithm. The examples do not include regrouping. |
Understanding place value when subtracting tens: | In this video tutorial from Khan Academy, explore the connection between place value and subtraction. This video explains how to solve a subtraction problem with numbers less than one hundred using base ten blocks. |
Understanding place value while adding tens: | Learn how to add 23 + 30 by thinking about place value. |