NC.1.MD.1
Order three objects by length; compare the lengths of two objects indirectly by using a third object.
Embedded Files
Step 1: Lesson Standards & Learning Goals
In this standard, students will order and sequence three objects by length. One of the measurement skills that is a focus in first grade is the precision of measuring length by measuring from one end of an object to the other end. Students are expected to demonstrate appropriate measurement processes and explain that their measurement is accurate based on where they started and ended measuring the length of an object.
The concept of transitivity is also a focus in first grade. (Transitivity means that if a = b and b = c, then a = c.)
For example, the blue crayon is longer than the red crayon, and the red crayon is longer than the yellow crayon. Based on the relationships the student can conclude that the blue crayon is longer than the yellow crayon. In this case, blue > red and red > yellow, therefore blue > yellow. The correct order would be blue (longest), red, yellow (shortest).
Sample Essential Questions
Sample Essential Questions
What strategies can we use to measure accurately?
How do we compare and order objects based on their length?
How does the precision of our measuring tools affect our measurements?
How do we determine the appropriate unit of measurement for different objects?
How can we communicate our measurements effectively to others?
What is transitivity and why is it important in mathematical reasoning?
What are some real-world examples where transitivity plays a significant role?
How can we use transitivity to draw conclusions?
How does transitivity help us understand order relations, such as less than or equal to, in mathematics?
Vocabulary
Vocabulary
long
longer
longest
short
shorter
shortest
order
measure
tall
taller
tallest
Students will be able to...
Students will be able to...
Use observation to compare the length of objects.
Compare the measurable attributes of objects.
Order three objects from shortest to longest.
Compare the lengths of two objects by using a third object.
Explain why their measurement is accurate.
Students will know...
Students will know...
Length is measured from one endpoint to another.
By aligning objects at one end, it can be determined which object is longer/shorter or taller/shorter.
Three objects can be measured and put in order from shortest to longest.
Transitivity shows the relationship (a>b, b>c, so a>c) among three objects.
Step 2: Assessment
NCDPI Math Assessment Released Forms
Grade 1 Math Assessment Practice Prompts
Grade 1 Released Summative Assessments
Step 3: Lesson Instructions
Possible Activating Strategies
Possible Activating Strategies
Exploration
Give students pencils of different lengths and have them put the pencils in order from shortest to longest. Ask how they know which pencil is longest.
Read Aloud
Teacher Resources
Teacher Resources
Tools 4 NC Teachers
Cluster 4 Lessons
Math Expressions - (Barnes and Hearne) - Standards Alignment
Motivation Math
Think Up! Math
Khan Academy - 1st Grade Math
Eureka Math/Engage NY Free Resources
Embarc Online (Eureka Math)
Zearn Math - Online Support Practice for Eureka Math (Requires free account)
North Carolina Collaborative for Mathematics Learning - Grade 1 Instructional Framework
NCDPI Resources
Grade 1 Math Assessment Practice Prompts
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