Chapter 1 of Class 5 Maths Mela, We the Travellers — I, moves place value into 5-digit numbers and adds rounding, expanded form, and a river-crossing logic puzzle.
Key Concepts
Place value: every digit’s value depends on its position — ones, tens, hundreds, thousands, ten-thousands.
Rounding rule: look at the digit just to the right of the place you’re rounding to — 5 or more rounds up, 4 or less rounds down.
Expanded form: writing a number as the sum of its place values, e.g. 4,215 = 4000 + 200 + 10 + 5.
Quick Recap
- 4,367 rounded to the nearest ten → 4,370; nearest hundred → 4,400; nearest thousand → 4,000.
- The river-crossing puzzle (lion, sheep, grass) builds step-by-step logical sequencing alongside the number work.
Common Mistake to Avoid
Students often check the wrong digit when rounding — always look one place to the right of the place you’re rounding to, not the original number’s last digit.
Frequently Asked Questions
Why round numbers instead of using the exact value?
Rounding gives a quick, easy-to-work-with estimate for costs, distances, or populations when an exact figure isn’t needed.
What skill does the river-crossing puzzle build?
Sequencing — deciding the order of moves so no combination is left unsafely alone, which is a logic skill separate from the number work.
Full walkthrough: Chapter 1 Solutions · Extra Questions.
