Measurement: Length with Non-Standard Units

Non-standard measurement teaches the concept before introducing the complexity of standard units. Children discover why standard units matter.

• Framework: Montessori
• Unit: Mathematics
• Learning area: Operations
• Level: Ages 3-5

Objectives

• Understand the concept of measurement
• Practice counting with purpose
• Compare lengths
• Prepare for standard measurement

Materials

• Objects to measure (books, tables, shoes)
• Non-standard units (paper clips, craft sticks, hand spans)
• Recording sheet
• Pencil

Instructions

1. Select object to measure. 2. Choose unit (paper clips). 3. Line up clips end-to-end along object. 4. Count clips. 5. Record: 'The book is 8 paper clips long.' 6. Measure same object with different unit. 7. Compare: why are numbers different?

Educator tip

The 'aha moment' comes when different children get different answers using different units—this motivates standard measurement.

Assessment

Child measures objects and records using non-standard units.

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