Kindergarten · Measurement
Direct Comparison — Length, Mass, and Capacity
Before centimetres and grams, there is direct comparison: placing two objects side by side to see which is longer, hefting one in each hand to feel which is heavier, pouring between containers to discover which holds more. These physical experiences are not pre-mathematics — they are mathematics. They build the conceptual framework that makes standard units meaningful when they appear in Grade 1 and 2.
LESSON VIDEO
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Lesson video
A short walkthrough to play in class or assign for flipped/at-home viewing.
WHAT STUDENTS WILL LEARN
✓Compare two objects directly for length using a common baseline
✓Compare two objects for mass using a pan balance or hefting (holding one in each hand)
✓Compare two containers for capacity by filling and pouring
✓Use mathematical language: longer/shorter, taller/shorter, heavier/lighter, holds more/holds less
✓Order three objects by a single attribute
✓Understand why a common baseline is essential for fair length comparison