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Pouring to Compare: Which Glass Holds More?
Lesson
Children often assume the tallest vessel holds the most; the fair-comparison method of pouring into identical containers directly challenges this. Watch for children who skip the guessing step and go straight to pouring — the guess-then-verify habit is the core practice being built here. Additional practice: Let us Do Q1(a–b) and Q2, p.141, may be assigned as consolidation or take-home observation.
0–10Open with the story of Ritu, Monu, and Nita: show three different-shaped glasses and ask children to guess who drank the most. Draw out the key question — can we judge by looking? Then display or describe the picture for Let us Discuss Q1–2, p.140 ("Who drank the most milk? Who drank the least milk?...") and invite children to discuss in pairs before sharing with the class.
10–20Demonstrate pouring the contents of each glass into identical same-sized containers so children see the fair-comparison method at work. Children then complete Let us Do Q3(a–c), p.141 ("fill in the blanks with 'more' or 'less'....") and Let us Do Q4(a–b), p.141 ("tick the right name....") in their notebooks.
20–40Children carry out the vessel activity — Let us Do (vessel activity), p.141 ("get three vessels; guess how many small bowls fill each....") — using a small bowl, glass, and water container available in class. They record guesses first, then pour to verify. A brief class share-out follows: whose guess was closest, and what surprised them?
Let us Do Q3(a–c), p.141 — Fill in the blanks with 'more' or 'less': Nita's glass holds ___ milk than Monu's; Monu's holds ___ than Nita's; Ritu's holds ___ than Nita's.
A jug holds more water than a glass. A glass holds more water than a cup. Fill in the blank: the cup holds ___ water than the jug.
- A exactly 1 litre more
- B less
- C more
- D the same
B. less
What each wrong option reveals
- A The child introduced a number not present in the comparison; this may reflect confusion between comparison language and the litre unit.
- C The child reversed the comparison direction, perhaps confusing 'more than' with 'less than' in the chain.
- D The child has not used the comparative information and defaulted to equality.
Also saved as 6 periods or 8 periods.
- 2From Ladles to Litres: Meeting the Standard
Lesson - 3Half and Quarter: Smaller Parts of a Litre
Lesson - 4Hands as Balances: Feeling and Comparing Weight
Lesson - 5The Salt Packet Standard: Feeling a Kilogram
Lesson - 6Estimating Half and Quarter Kilogram Around the House
Lesson - 7One Weighing Only: Reasoning with a Pan-Balance
Lesson - 8Capacity Connections: From Comparison to the Litre
Lesson - 9From Coins to Kilograms: Connecting Informal and Standard Weight
Lesson - 10Measure It All: A Chapter Showcase of Capacity and Weight
Lesson
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