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Interactive
CK-12 Foundation

Properties of Equality and Congruence: Justifying Algebraic Steps

For Students 8th - 10th
No need to justify using this resource. Learners drag justifications for each step of solving an equation in an interactive. To see if they are correct, all they need to do is use a slider and the correct answers appear.
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Lesson Plan
Curated OER

Justifying Answers

For Teachers 2nd - 3rd
Young scholars study story problems and learn how to find and justify their answers. They will use a story problem and then respond to the prompt questions from the teacher. They must add and subtract facts to 6 and learn how to justify...
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Worksheet
2
2
K12 Reader

Justify Your Answer

For Students 2nd - 3rd Standards
How do you check to see if an answer to a question is correct? Just follow the four simple steps outlined in this reading comprehension worksheet.
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Lesson Plan
EngageNY

Justifying the Geometric Effect of Complex Multiplication

For Teachers 11th - 12th Standards
The 14th lesson in the unit has the class prove the nine general cases of the geometric representation of complex number multiplication. Class members determine the modulus of the product and hypothesize the relationship for the...
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Lesson Plan
West Contra Costa Unified School District

Divisibility Rules Justified

For Teachers 6th - 8th
How do you know if a number is divisible? Instructors first prove the divisibility rules for three and four and then class members use this modeling to prove given divisibility rules for eight and nine either individually or in groups.
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Lesson Plan
Alabama Department of Archives and History

The Wrong Side of History: How One Group Justified Its Opposition on the Freedom Riders and Civil Rights for African Americans

For Teachers 11th - 12th Standards
Designed as a supplement to the study of the Freedom Riders, this resource uses primary sources to reveal the views of those who opposed the Freedom Riders. After careful study of the arguments presented by the members of the Montgomery...
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Activity
1
1
Illustrative Mathematics

Hexagonal Pattern of Beehives

For Teachers 9th - 12th Standards
Young geometers and biologists investigate the math of nature in an activity that is just the bee's knees. Participants will study the tessellations of hexagons in a beehive, along with the natural rationale behind the specific shape....
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Assessment
Bowland

Cats and Kittens

For Students 6th - 8th
Can a cat have 2,000 descendants in 18 months? To determine if this claim is realistic, individuals must take different pieces of information into account when justifying their responses.
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Unit Plan
Mathematics Vision Project

Module 4: Equations and Inequalities

For Students 8th - 10th Standards
Can you justify that mathematically?  Help learners see the process of solving as using mathematical properties rather than a set of steps to memorize in the fourth module of a nine-part Algebra I series. The module contains six lessons...
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Lesson Plan
Curated OER

The Power of Graphical Display: How to Use Graphs to Justify a Position, Prove a Point, or Mislead the Viewer

For Teachers 6th - 8th
Analyze different types of graphs with learners. They conduct a survey and determine the mean, median and mode. They then identify different techniques for collecting data.
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Lesson Plan
Curated OER

Comparing Fractions

For Teachers 3rd - 5th Standards
Learners compare three sets of fractions using the greater than, less than, and equal signs. To justify their answers, a drawing is also required that illustrates their reasoning. Including fractions with like and unlike denominators, as...
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Lesson Plan
Curated OER

Justifying Answers

For Teachers 1st - 2nd
Students demonstrate how to solve word problems. In this problem solving lesson, students use strategies such as drawing pictures, using counters, and making a table to justify how they solved the word problem.
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Worksheet
Curated OER

Six Solve Algebraic Properties and Justify Steps

For Students 8th - 10th
In this solving linear equations worksheet, students solve six equations and justify each step of their proofs by stating the algebraic property used.
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Lesson Plan
1
1
National Endowment for the Humanities

The House Un-American Activities Committee

For Teachers 9th - 12th Standards
Was the House Un-American Activities Committee justified in investigating subversive influences in the entertainment industry? Part two of the three-part series of lessons that examine the anti-communism movement after World War II,...
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Lesson Plan
Curated OER

Toothpick Triangles

For Teachers 8th - 12th
Explore patterns, variables, and mathematical relationships when you examine patterns with toothpicks and determine the next sequence of figures. Your class writes and justifies a formula based on the sequence. An answer key is included.
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Lesson Plan
NPR

Civil Rights of Japanese-American Internees

For Teachers 9th - 12th Standards
Prompted by a viewing of Emiko and Chizu Omori’s Rabbit in the Moon, a documentary about the internment of Japanese-Americans during World War II, high schoolers examine a series of documents, including the Bill of Rights and the UN’s...
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Lesson Plan
Curated OER

Modeling Conditional Probabilities 1: Lucky Dip

For Teachers 9th - 12th Standards
Check out this detailed lesson plan on conditional probability!  Learners work individually and also collaboratively to analyze the fairness of a game and justify their reasoning. it includes detailed notes and many helpful suggestions...
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Lesson Plan
3
3
Project Tahoe

Individual Rights vs. The Greater Good Within the Scope of War

For Teachers 11th - 12th Standards
When, if ever, is the government justified in restricting individual rights? When, if ever, should the "greater good" trump individual rights? To prepare to discuss this hot-button topic, class members examine primary source documents,...
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Printables
Teachers Development Group

Habits of Mind Interaction Posters

For Teachers 5th - 12th Standards
From generalizing and justifying to megacognition reflection and perseverance, keep the 16 Habits of Mind as part of an ongoing and developing conversation in your class by displaying these posters around your room throughout the school...
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Unit Plan
Core Knowledge Foundation

Unit 3: Adventures of Don Quixote

For Teachers 5th Standards
Fifth graders explore the Adventures of Don Quixote in a four-week language arts unit. Scholars listen to and discuss a new chapter each day as well as examine vocabulary and practice word work including suffixes, subject-verb agreement,...
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Lesson Plan
Curated OER

Investigation-Reasoning and Proof

For Teachers 3rd
Third graders determine the outcome of each of the following situations and justify their findings: even number + even number = ?, even number + odd number = ?, odd number + odd number = ?, and odd number + even number = ?.
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Lesson Plan
National Endowment for the Humanities

Lesson 2: Religion and the Argument for American Independence

For Teachers 9th - 12th Standards
Young scholars examine how religion affected arguments justifying American independence. They read and analyze primary source documents, and write an essay analyzing how Americans used religious arguments to justify revolution against a...
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Assessment
1
1
Inside Mathematics

Quadratic (2006)

For Teachers 9th - 12th Standards
Most problems can be solved using more than one method. A worksheet includes just nine questions but many more ways to solve each. Scholars must graph, solve, and justify quadratic problems.
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Lesson Plan
Curated OER

Using Fairy Tales to Debate Ethics

For Teachers K - 8th
Is trickery ever justified? Is it okay to steal from someone who has stolen from you? Puss, from Puss in Boots, and Jack, from Jack and the Beanstalk, might have some ideas about these ethical questions. After listening to a series of...

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