• # Elementary Mathematics Grade 2 Unit 4

Subject: Mathematics
Timeline: 7 Days
Unit 4 Title: Measurement

Unit Overview:

This unit will give students the opportunity to discuss and summarize everyday experiences with measurement. Unit 4 focus is:  measuring with inches, feet, and centimeters. Students will be introduced to the ruler in the form of 12 inches and 6 inches. They will be able to compare lengths of line segments that are measured in inches and centimeters.

Unit Objectives:

At the end of this unit, all students must understand how to measure and estimate lengths in standard units (inches, feet, and centimeters) using appropriate tools.  Students will know how to measure to determine how much longer one object is than another.  Children will be able to use addition and subtraction to solve word problems involving length.

Focus Standards:

PA.CCSS.Math.Content.CC.2.4.2.A.1 Measure and estimate lengths in standard units using appropriate tools.(2.MD.1, 2.MD.2, 2.MD.3, 2.MD.4)
PA.CCSS.Math.Content.CC.2.4.2.A.6 Extend the concepts of addition and subtraction to problems involving length (2.MD.5)

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 simply jumping into a solution attempt. Proficient students check their answers to problems using a different method. They continually ask themselves, “Does this make sense?” They can understand the approaches of others to solving complex problems and identify correspondences between different approaches.

#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.

#6  Attend to precision.

Mathematically proficient students try to communicate precisely to others.  They try to use clear definitions in discussion with others and in their own reasoning.  They state the meaning of symbols they choose, are careful about specifying units of measure, calculate accurately and efficiently, and express numerical answers with a degrees of precision appropriate for the problem context.

Concepts - Students will know:
• How to measure and estimate lengths in standard units.
• How to identify a 6-inch and 12-inch ruler
Competencies -Students will be able to:
• Measure the length of an object by selecting and using appropriate tools.
• Estimate lengths using units of inches, feet, centimeters, and meters.
• Measure to determine how much longer one object is than another.
• Use addition and subtraction within 100 to solve word problems involving lengths that are given in the same units.

Assessments:
• Unit 10 Assessment and Exit Slips (Quizzes)
• Daily RSA

Elements of Instruction:

Expect to use differentiation options for students who may not have mastery of these skills. First Grade Common Core State Standards for Measurement and Data, students are able to express the length of an object as a whole number of  length units, by laying multiple copies of a shorter object (the length unit) end to end. Children have an understanding that the length measurement of an object is the number of same-size length units that span it with no gaps or overlaps.

Differentiation:

Each lesson has differentiation options for each portion of the lesson. Additional differentiation options are listed with directions and student masters in the Teacher’s Guide.

Interdisciplinary Connections:
• Program related literature books and daily math routines.

Additional Resources / Games:

Students will play a variety of games that directly support the content of the lesson and the overall goals for the unit. Games for unit nine include:
• Name That Number