Weighing and Comparing Mass

Weighing with a balance scale provides concrete experience with mass as a measurable attribute and introduces the concept of balance/equality.

• Framework: Montessori
• Unit: Mathematics
• Learning area: Measurement
• Level: Ages 4-6

Objectives

• Compare masses of objects
• Use balance scales
• Develop concept of heavy and light

Materials

• Balance scale
• Standard weights (gram)
• Classroom objects to weigh
• Recording sheet

Instructions

1. Present balance scale. 'When both sides are the same, it balances.' 2. Place apple on one side. 'Which side is heavier?' 3. Add weights to other side until balanced. 4. Count weights: 'The apple weighs 150 grams.' 5. Compare two objects: 'Which is heavier?' 6. Order objects by mass.

Educator tip

Start with 'which is heavier' comparisons before introducing precise measurement with weights.

Assessment

Child uses balance scale to compare and measure mass of objects.

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• Constructive Triangles: First Box
• Metal Insets: Geometric Drawing
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• Sorting and Classifying Objects