Maths Mela, period by period — fitted to your timetable.
Tell Meyy your periods and their length; it plans every chapter of Maths Mela to fit, and you tick off sections as you teach.
Playing NIM: Adding 1 or 2 to Reach Ten
Lesson
Watch for children who add randomly and never ask why certain numbers feel winning — push them to articulate: 'If I land here, what can my opponent do?' A common error is thinking 9 is a safe number; help the class see that from 9 the opponent must reach exactly 10 in one move of 1.
0–8Introduce NIM Game, p.149 ("Play the two-player NIM game: each player alternately chooses 1 or 2....") — Pairs play three or four rounds. The teacher circulates, asking players to say each running total aloud so the class hears the addition accumulating.
8–25Continue NIM Game, p.149 — After open play, guide children to ask: which running totals feel safe to land on? Introduce the idea of a 'safe number' — a total from which any opponent move leaves you in control.
25–40Can you win the game if (a)(b)(c), p.149 ("Can you win if: (a) opponent reached 6, (b) opponent reached 7....") — Pairs work through all three cases and share conclusions. The class discusses what pattern links the safe numbers.
NIM Game, p.149 — Play the two-player NIM game: each player alternately chooses 1 or 2 to add to the running total; first to reach 10 wins. Play for a few rounds.
Priya and Dev are playing NIM. They take turns adding 1 or 2 to a running total. The first player to reach 10 wins. The total is now 7 and it is Priya's turn. What should Priya add to be sure she wins?
- A Add 1 to make the total 8
- B Add 2 to make the total 9
- C Add 3 to make the total 10
- D Either 1 or 2 — Priya wins whichever she picks
D. Either 1 or 2 — Priya wins whichever she picks
What each wrong option reveals
- A The student thinks landing on 8 guarantees a win, not recognising Dev can add 2 to reach 10 immediately.
- B The student thinks landing on 9 is safe, not recognising Dev can add 1 to reach 10 immediately.
- C The student thinks adding 3 is allowed, misreading the rule that only 1 or 2 may be added per turn.
Also saved as 7 periods or 10 periods.
- 2NIM Extended, Then Patterns in the Addition Table
Lesson - 3Window Frames: Row, Column, and Diagonal Sums
Lesson - 4Reversing Digits: What Sums Do We Always Get?
Lesson - 5Skip-Count Sequences, Then 4-Digit Addition Begins
Lesson - 6Three-Addend Addition and Multi-Step Tiger Problems
Lesson - 7Subtracting 4-Digit Numbers: Meghalaya Elephants
Lesson - 8Kaziranga Visitors and Juice Factory: Multi-Step Problems
Lesson - 9Column Drill and Baal Mela Deposit Slips
Lesson - 10Column Form Consolidation: Four Pre-Set and Eight Notebook Problems
Lesson - 11Easy Ways, Comparisons, and Derived Facts in Addition and Subtraction
Lesson - 12From NIM to Number Sense: A Whole-Chapter Celebration
Lesson
- 1. Shapes Around Us
- 2. Hide and Seek
- 3. Patterns Around Us
- 4. Thousands Around Us
- 5. Sharing and Measuring
- 6. Measuring Length
- 7. The Cleanest Village
- 8. Weigh It, Pour It
- 9. Equal Groups
- 10. Elephants, Tigers, and Leopards
- 11. Fun with Symmetry
- 12. Ticking Clocks and Turning Calendar
- 13. The Transport Museum
- 14. Data Handling
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