Maths Mela, period by period — fitted to your timetable.
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Are These Weights Right? Reading Scales
Lesson
A very common error is reading all scales as if every small division equals 1 g or 1 kg — students need to count the total divisions and compute the value of each before reading. Encourage children to voice their reasoning for plausibility judgements, using the gram–kilogram distinction as the anchor.
0–10Open with a class discussion: hold up or name everyday objects (a book, a chair, a grain of rice) and invite children to say whether they would weigh them in grams or kilograms and roughly how heavy each might be. Record responses on the board without correcting yet — the aim is to surface existing intuition about the two units.
10–22Students work individually on Check! Check!, p.104 ("Tick the items from Anu's list whose recorded weights look correct…."). After a quick count-round to gather answers, the class discusses which entries are implausible and why, articulating the gram–kilogram distinction in their own words.
22–40Introduce the six dial scales in Let Us Do, p.104 ("Read six dial weighing scales (a–f)…."). Draw attention to the board: each scale has a different maximum and different sub-divisions. Children read and record each reading, then pairs compare and resolve any discrepancies. Close by naming the key idea from the teacher's note — that understanding where '0' sits and how sub-divisions are spaced is what makes reading any scale reliable.
Check! Check!, p.104 — Tick the items from Anu's list whose recorded weights look correct (almirah 40g, bed 60kg, rice bag 5kg, sofa 30g, bucket 1kg800g, water bottle 650g, refrigerator 50g).
A student wrote the weight of a dining table as 15 g and a tube of toothpaste as 200 g. Which statement is correct?
- A Both weights are correct.
- B Both weights are wrong; both should be in kg.
- C The dining table weight is wrong; it should be in kg. The toothpaste weight is reasonable.
- D The toothpaste weight is wrong; it should be in kg.
C. The dining table weight is wrong; it should be in kg. The toothpaste weight is reasonable.
What each wrong option reveals
- A Student does not distinguish gram and kilogram referents and accepts any numerical value as plausible.
- B Student over-applies kilograms and does not recognise grams as the correct unit for small everyday items.
- D Student misidentifies the plausible item — confusing which object's unit is wrong.
Also saved as 8 periods or 11 periods.
- 2Two Balances, One Weight — Discovering 1 kg = 1 000 g
Lesson - 3Grams from Kilograms — Baking with Shrenu
Lesson - 4Heavier or Lighter? Ordering the Picnic Fruits
Lesson - 5Ants and Medicine — Introducing the Milligram
Lesson - 6The King's Wheat and the Full Weight Chain
Lesson - 7Rathna's Pongal Shopping — Adding and Subtracting kg and g
Lesson - 8Multiplying and Dividing Compound Weights
Lesson - 9Tea Cups and Water Bottles — Meeting Litres and Millilitres
Lesson - 10Khayal Chacha's Deliveries — The l and ml Double Number Line
Lesson - 11At the Petrol Pump — Comparing and Operating with l and ml
Lesson - 12Picnics, Juice Vendors, and Oil — Multi-step Capacity Problems
Lesson - 13Weight and Capacity — Bringing the Whole Chapter Together
Lesson
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