Chapter 4 of Class 5 Maths Mela, We the Travellers — II, continues the travel theme, using road-trip and shopping scenarios to practise addition and subtraction with regrouping.
Key Concepts
Regrouping: carrying over in addition and borrowing in subtraction when a column’s total is too big or too small.
Multi-step word problems: combining addition and subtraction in one problem, like adding fuel and ticket costs, then subtracting from a budget.
Estimating first: rounding the numbers to get an approximate answer before calculating the exact one.
Quick Recap
- Estimate before calculating exactly — it catches mistakes if the final answer looks way off.
- Add all costs first, then subtract the total from the budget to find what is left.
Common Mistake to Avoid
Skipping the estimate step — students who calculate directly without estimating often don’t notice when they’ve made a regrouping error.
Frequently Asked Questions
Why estimate before calculating an exact answer?
It gives a quick sanity check — if the exact answer is very different from the estimate, there’s likely a calculation mistake.
What is regrouping in subtraction commonly called?
Borrowing — taking a value from the next column to the left when the top digit is smaller than the one being subtracted.
Full walkthrough: Chapter 4 Solutions · Extra Questions.
