• # Elementary Mathematics Grade 5 Unit 5

Subject: Mathematics
Timeline: 19 days
Unit 5 Title: Prime Time

Unit Overview:

This unit focuses on the properties of whole numbers, especially those related to multiplication and division. Students will learn about factors, multiples, divisors, prime numbers, composite numbers, common factors and multiples, and many other ideas about numbers. Students will participate in a series of activities that reflect many of the key properties of numbers and learn how to use these properties to solve problems.

Unit Objectives:

At the end of this unit, all students must be able to demonstrate knowledge of whole numbers. Students must be able to define factors, multiples, divisors, prime numbers, composite numbers, common factors and multiples, and prime factorization. Along with being able to define these concepts, they must also be able to demonstrate their knowledge of these concepts through investigations and real-life situations.

Focus Standards:

PA.CCSS.Math.Content.CC.2.1.6.E.3 Develop and/or apply number theory concepts to find common factors and multiples. (6.NS.4)

Mathematical Practice Standards:

#1 Make sense of problems and persevere in solving them.

Mathematically proficient students start by explaining to themselves the meaning of a problem and looking for entry points to its solution. They analyze givens, constraints, relationships and goals. They make conjectures about the form and meaning of the solution and plan a solution pathway, rather than jumping into a solution attempt. They monitor and evaluate their pathway and change course if necessary. Mathematically proficient students check their answers to problems using a different method and continually ask themselves, “Does this make sense?”

#2 Reason Abstractly and Quantitatively.

Mathematically proficient students make sense of quantities and their relationships in problem situations. They bring two complimentary abilities to bear on problems involving quantitative relationships: the ability to decontextualize and the ability to contextualize. Quantitative reasoning entails habits of creating coherent representation of the problem at hand; considering the units involved; attending to the meaning of quantities, not just how to compute them; and knowing and flexibly using different properties of operations and objects.

#4 Model with mathematics.

Mathematically proficient students can apply the mathematics they know to solve problems arising in everyday life, society, and the workplace. In early grades, this might be as simple as writing an addition equation to describe a situation.

#5 Use appropriate tools strategically.

Mathematically proficient students consider the available tools when solving a mathematical problem. These tools might include pencil and paper, concrete models, a ruler, a protractor, or a calculator. Proficient students are sufficiently familiar with tools appropriate for their grade to make sound decisions about when each of these tools might be helpful, recognizing both the insight to be gained and their limitations.

#6 Attend to precision.

Mathematically proficient students try to communicate precisely to others. They use clear definitions in discussion with others and in their own reasoning. They are careful about specifying units of measure, specifying axes and use careful calculations.

#7 Look for and make use of structure.

Mathematically proficient students look closely to discern a pattern or structure. Young students, for example, might notice that three and seven more is the same amount as seven and three more, or they may sort a collection of shapes according to how many sides the shapes have.

#8 Look for and express regularity and repeated reasoning.

Mathematically proficient students notice if calculations are repeated and look both for general methods and for shortcuts. Upper elementary students might notice when dividing 25 by 11, that they are repeating the same calculations over and over again and conclude they have a repeating decimal. As they work to solve a problem, mathematically proficient students maintain oversight of the process, while attending to the details. They continually evaluate the reasonableness of their intermediate results.

Concepts - Students will know:
• The definitions of factor and multiple
• The concept of prime factorization
• The difference between prime and composite numbers
• How to find common multiples
Competencies -Students will be able to:
• Use factors and multiples to make numbers common
• Break apart numbers until there are in their prime factorization stages
• Define whether a number is prime or composite

Assessments:

Formative Assessments:
• Informal assessments on learning targets
• Exit Slips
• Quizzes
• Self-Assessment
Summative Assessment:
• Unit Assessment - Prime Time

Elements of Instruction:

With the Grade 4 Common Core State Standards stating that students should be fluent with their multiplication facts, this unit of study will expand on the reasons why multiplication works. They will be able to develop a deeper understanding of the multiplication operation.

Differentiation:

Each lesson and/or unit offers a wide variety of ways to differentiation for all levels of learners.  These include:
• Special Need Handbook (adapting instruction/lessons)
• Unit Projects
• Spanish Additional Practice and Skills guide
• Strategies for English Language Learners Guide
• “Extension” homework questions

Interdisciplinary Connections:
• Mathematical Reflections
• “Did You Know?” sections
• phschool.com and web codes
• “Connections” homework questions
• The real-world context embedded in lesson problems

CMP2 and/or the Erie School District provide the following additional resources to aid students in achieving mathematical success.
• Additional Practice worksheets per investigation
• Skills Review worksheets to target key components of each investigation
• Parent letter to be sent home prior to beginning the unit to share with parents the skills, goals, and
• expectations of the coming unit.
• Assessment Resources workbook with extra test items (multiple choice, essay, open ended,
• question bank, etc)
• Investigation specific pre-generated notebooks that include tables, graphs, problem numbers, and all
• other items students may need to complete the investigation and all its parts.  Students are provided
• with one per unit.
• Reflection questions at the end of each investigation to assess students’ comprehension of key
• concepts.
• phschool.com and web codes
• Transparencies of models, graphs, etc used within lesson(s)