Linear Measurement and Number Lines
Students begin to explore linear measurement in early primary grades. Experiences measuring
and comparing lengths with both nonstandard and standard units help students build the
foundation to understand other linear representations such as number lines. Explore the
posts linked below to find out more about building student understanding of linear measurement.
Measuring and Comparing Length
Describing and Comparing Length
Explore how the attribute of length can be described and compared directly and indirectly.- Measuring with Non-Standard Units
See how working with non-standard units allows students to explore measuring length and the relationship between the size of the unit and the number of units needed to measure an item. - Creating and Using an Inch-Worm Ruler
Watch how students can create their own ruler using inch-worms. - Measuring to the Nearest Half or Fourth of an Inch
See how students can begin to measure to the nearest half or fourth of an inch.
Connections to Linear Representations and Number Lines
- Introducing Cuisenaire Rods (C-Rods)
Learn about C-rods, which can provide a supportive linear structure to measure, build number lines, and represent fractions and operations. - Creating Number Lines
Students can build their understanding of number lines by creating them using different units. 
Beyond the Ruler: Using Number Lines to Build Number Sense
Using and building number lines supports students’ understanding as they move from counting discrete items to continuous thinking.- Learning Math through Representation
LMR is a free, research-based curriculum that uses number lines and Cuisenaire rods (C-rods) to help students build their understanding of numbers