﻿ Gr. 1 Measure Length ~ Math Units of Study ~ Instruction ~ School Improvement in Maryland

# Gr. 1 Unit: Measure Length

### Lesson Seeds

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##### Unit Overview

This unit extends the work that was done in Kindergarten using direct comparison. Students in Grade 1 should carefully consider all endpoints when appropriate. In situations where direct comparison is not possible, students should be able to use indirect comparison and explanations that draw on transitivity. Students move from directly comparing objects to indirectly comparing objects, and ordering objects by measurement length, which involves assigning a number to a length. Students use manipulative units that have a standard unit of length, such as centimeter cubes or inch manipulatives end-to-end and count them to measure a length. Through numerous experiences and careful questioning by the teacher, students will recognize the importance of careful measuring so that there are not any gaps or overlaps in order to get an accurate measurement. This concept is a foundational building block for the concept of area in Grade 3.

Essential Questions:

• Why do I measure?
• Why do I need standardized units of measurement?
• How does what I measure influence how I measure?
• What types of problems are solved with measurement?
• What are tools of measurement and how are they used?
• How do units within a system relate to each other?
• When is an estimate more appropriate than an actual measurement?
• What strategies help estimate measurements?

A question is essential when it stimulates multi-layered inquiry, provokes deep thought and lively discussion, requires students to consider alternatives and justify their reasoning, encourges re-thinking of big ideas, makes meaningful connections with prior learning, and provides students with opportunities to apply problem-solving skills to authentic situations.

##### Unit Lesson

Additional information such as Teachers Notes, Enduring Understandings,Content Emphasis by Cluster, Focus Standards, Possible Student Outcomes, Essential Skills and Knowledge Statements and Clarifications, and Interdisciplinary Connections can be found in this Lesson Unit.

##### Available Model Lesson Plans

The lesson plan(s) have been written with specific standards in mind. Each model lesson plan is only a MODEL - one way the lesson could be developed. We have NOT included any references to the timing associated with delivering this model. Each teacher will need to make decisions related ot the timing of the lesson plan based on the learning needs of students in the class. The model lesson plans are designed to generate evidence of student understanding.

This chart indicates one or more lesson plans which have been developed for this unit. Lesson plans are being written and posted on the Curriculum Management System as they are completed. Please check back periodically for additional postings.

CCSC Alignment: 1.MD.A.1

Using hands-on activities and concrete manipulatives, student will understand that the length is the distance measured from one end point to another end point, that the distance between the two end points is the length, and that both the length and the width are measurements of length.

##### Available Model Lesson Seeds

The lesson seed(s) have been written with specific standards in mind. These suggested activity/activities are not intended to be prescriptive, exhaustive, or sequential; they simply demonstrate how specific content can be used to help students learn the skills described in the standards. Seeds are designed to give teachers ideas for developing their own activities in order to generate evidence of student understanding.

This chart indicates one or more lesson seeds which have been developed for this unit. Lesson seeds are being written and posted on the Curriculum Management System as they are completed. Please check back periodically for additional postings.

CCSC Alignnment: 1.MD.A.2

Using snap cubes or paperclips as length units of measure, students will measure and record the length of various items in the room. They will compare their measurements to those of their classmates and explain why their measurement is accurate.