Shortest Path
Comprehensive notes, formulas, and practice questions for Shortest Path.
Shortest Path
Shortest Path
What you'll learn
- On a grid, move along lines — no diagonal shortcuts unless allowed.
- Shortest path = fewest steps/blocks.
- Count Manhattan distance: right + up blocks only.
- Avoid unnecessary detours in puzzles.
Key concepts
Level 1 — Core idea
Verbal: From home to shop 3 blocks east and 2 north — one shortest route is 5 moves.
Symbolic: Shortest steps = |Δeast| + |Δnorth| on grid.
Visual: City block grid — trace L-shaped path.
Level 2 — Going deeper
Many shortest paths exist (zigzag same length). Do not go past target and back — wastes steps.
NCERT anchor
NCERT Math Mela, Chapter 4 grid patterns support path counting. Use squared notebook.
Worked example
Start (0,0), end (3,2) — minimum blocks?
Step 1 — Move 3 east + 2 north (or interleave)
Step 2 — Total = 3 + 2 = **5 blocks**
Answer: **5** minimum ✓
Go 2 east, 1 north, then 1 west — at end, how far from start?
Step 1 — Net east: 2−1 = **1**
Step 2 — Net north: **1**
Step 3 — Shortest back = 1+1 = **2** blocks (not path taken length)
Common mistakes
| Mistake | Why | Fix |
|---|---|---|
| Diagonal one step | Grid rule ignored | Unless stated, along grid lines |
| Count turns not blocks | Wrong unit | Count each edge step |
| Longer scenic route | Detour accepted | Minimum = no extra loops |
| Add all moves including backtrack | Gross vs net | For distance, use net displacement |
Quick check
- 2 east + 2 north — min steps?
- Why avoid detours?
- Draw 3×3 grid shortest corner to corner.
- Stretch: How many different shortest paths 2 east + 2 north? (6 — intro)
Revision tip: Mark start and end dots; only move toward target each step for shortest path.
Open the Practice tab for graded questions on Shortest Path.
Interactive Exploration Suggestions (Drishti Live Worlds)
- Use the platform-native live simulation or PhET-style tool for this topic (number line, Venn, physics playground, molecule builder, sensor dashboard, etc.).
- Mirror / body / home activity: physically do the concept (count objects, measure, role-play) and photograph or describe for portfolio.
- Voice or text reflection with AI Mentor: explain the concept to a younger student or family member.
AI Mentor Prompts (Socratic, Board-Adaptive)
- "Explain this concept to a Class 6 student using one real example from an Indian home, school, market, or festival."
- "What is one common mistake students make here, and how would you catch yourself making it?"
- Stretch: "How does this connect to coding, robotics, money, health, environment, or a future career?"
Gamification, Portfolio & Parent Visibility
- Complete the core practice + one extension activity (photo, table, short reflection, or mini-project) for base XP + topic badge.
- 5-7 day streak or family discussion note = multiplier + visible artifact in parent/principal dashboard.
- Best real-world application stories (anonymised) featured on class or national leaderboard.
Robotics, STEM & Future Skills Bridges
- One hands-on project or measurement using the Drishti kit or household items that makes the concept physical.
- Direct link to at least one Future Skill track (Money Management, Green Tech, Cyber Defenders, Micro-Entrepreneurship, AI Mastery, Sustainable Living, Personality Development).
- Coding extension where relevant (simple script, simulation, or data logging).
NEP 2020 & Full Education OS Alignment
This material emphasises experiential "learning by doing", competency (apply/create/analyse), vocational exposure, critical thinking, and multidisciplinary connections. Designed to feed live worlds, AI Mentor (with memory), gamification, robotics, parent analytics, and future skills — not just exam prep.
Portfolio Evidence Idea: Your photo/table/reflection/project + one sentence on "How this helps me in real life or a possible future path."
Open the Practice tab for aligned questions (easy/medium/hard + case-based) with full AI scaffolding.
See curriculum for cross-links and the full future-skills/robotics chapters.
Key Takeaways (TL;DR)
- What you'll learn
- Key concepts
- Worked example
- Common mistakes
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