Measurement — Weight and Mass

Mass is how much matter; weight is gravity's pull on it. On the moon your weight differs but mass doesn't. Indirect aim: scientific precision, preparation for physics, everyday measurement skill.

• Framework: Montessori
• Unit: Mathematics
• Learning area: Operations
• Level: Ages 7-9

Objectives

• Measure in grams, kilograms, tons
• Distinguish weight (force) from mass (quantity of matter)
• Convert between units
• Weigh real objects with scale

Materials

• Kitchen and bathroom scales
• Weights (100g, 500g, 1kg)
• Conversion chart
• Various objects to weigh

Instructions

1. Weigh small objects in grams. 2. Weigh larger in kg. 3. Convert: 1 kg = 1000 g. 4. Research tons (metric = 1000 kg; US = 2000 lb). 5. Distinguish weight vs mass: same mass on Earth and Moon, different weight. 6. Weigh a child — mass. 7. Apply in cooking (recipe grams). 8. File.

Educator tip

The weight-vs-mass distinction is often skipped. Teach it here — it matters in physics.

Assessment

Observe measurement accuracy, conversion, and understanding of the distinction.

More from Mathematics

• Measurement — Capacity and Volume
• Measurement — Time and Calendar
• Measurement — Temperature and Thermometry
• Algebra — Simplifying Expressions
• Algebra — Solving Multi-Step Equations
• Order of Operations — PEMDAS
• Probability — Coin, Dice, Cards
• Statistics — Mean, Median, Mode