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Chapter 12 · Period 1 of 8 · 40 min
Bundling Hundreds: Add with Blocks and Jumps
Lesson
Students often write the regrouped ten as a separate digit rather than carrying it into the hundreds column — watch for this and return to the block model to show the physical exchange. The snake/caterpillar chain reinforces the ones-then-tens sequence in a low-stakes format before word problems appear.
0–10Open with the Kishan nursery story from the chapter. Pose the question: how do we add 364 plants and 52 more? Students talk in pairs about what they already know about hundreds, tens, and ones. Draw a blank HTO box on the board together.
10–25Using Dienes blocks (or drawn squares/rods/dots), model 364 + 52 on the HTO table. Combine the tens column to get 11 tens; guide students to see that 10 tens make a new hundred. Record the regrouped result. Show the number-line +10 jumps as a parallel pictorial path for the same addition.
25–40p.150 ("Complete snake/caterpillar chains: Add 2 from 334; Add 5....") Students work independently on the chain warm-up, applying the same place-value thinking practised with blocks. Walk the room; prompt students to name which digit changes when they add ones.
Assessment
p.150 — Complete snake/caterpillar chains: Add 2 from 334; Add 5 from 375; Subtract 5 from 387.
Start at 375 and add 5. What number do you reach?
- A 370
- B 380
- C 385
- D 475
B. 380
What each wrong option reveals
- A The student subtracted 5 instead of adding, giving 370.
- C The student added correctly in the ones but forgot to carry the exchange into the tens column, writing 385.
- D The student added 5 to the hundreds digit instead of the ones, giving 475.
Chapter 12 · 8 periods of 40 min
Also saved as 5 periods.
- 2Packing Saplings: Exchange Tens and Hundreds to Subtract
Lesson - 3Grid Moves and Chain Patterns: Place Value Made Visible
Lesson - 4Same Money, Different Notes: Exploring Currency Equivalence
Lesson - 5Open-Ended Buying and Peter Uncle's Shop Problems
Lesson - 6Estimate, Compare, and Connect: From Money to Mental Arithmetic
Lesson - 7Number Web and Card Game: Strategy Meets Computation
Lesson - 8Give and Take — Bringing the Whole Chapter Together
Lesson
Maths Mela · Class 3 · 14 chapters
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