# 2.8 - Estimate and Measure

The student will

a) estimate and measure length to the nearest inch

b) estimate and measure weight to the nearest pound.

### BIG IDEAS

• So that I can focus on developing the skills and tools needed to measure length, weight/mass, and capacity is the foundation for quantifying the world around us and its usefulness in many aspects of daily life
• So that I can recognize examples include measuring one’s weight and height, cooking, consumer skills, etc

### UNDERSTANDING THE STANDARD

• The process of measurement involves selecting a unit of measure, comparing the unit to the object to be measured, counting the number of times the unit is used to measure the object, and arriving at an approximate total number of units.
• Measurement involves comparing an attribute of an object to the same attribute of the unit of measurement (e.g., the length of a cube measures the length of a book; the weight of the cube measures the weight of the book).
• A clear concept of the size of one unit is necessary before one can measure to the nearest unit.
• The experience of making a ruler out of individual units of length can lead to greater understanding of using one.  A ruler takes those units of length and numbers them.  Measurement of length is counting the number of units.A “broken ruler” is a useful tool for students to use in order to develop an understanding of counting the number of units.
• Students benefit from experiences that allow them to explore the relationship between the size of the unit of measurement and the number of units needed to measure the length of an object.
• Benchmarks of common objects need to be established for one pound. Practical experience measuring the weight of familiar objects helps to establish benchmarks.

### ESSENTIALS

 The student will use problem solving, mathematical communication, mathematical reasoning, connections, and representations to Identify a ruler as an instrument to measure length. (a)Estimate and then measure the length of various line segments and objects to the nearest inch using a ruler. (a)Identify different types of scales as instruments to measure weight. (b)Estimate and then measure the weight of objects to the nearest pound using a scale. (b)

### KEY VOCABULARY

Updated: Aug 22, 2018