The key ideas of this chapter, answered through the six guiding questions. Read them with your textbook.
🧠 Concept map: Time, money and measurement
1What am I looking at?
Answer: Units of time, money, length, weight and capacity and changing between them.
2What are its main parts or ideas?
Answer: 1 hour = 60 min, 1 m = 100 cm, 1 kg = 1000 g, 1 L = 1000 mL, ₹1 = 100 paise.
3How does it work?
Answer: Multiply to change a big unit to a small one and divide to change small to big.
4Why is it important?
Answer: Shopping, cooking, travel and schedules all use these units.
5What happens if something changes?
Answer: Using a wrong unit gives silly answers — a pencil is 15 cm, not 15 m.
6What should I remember for the exam?
Answer: Conversions, bills, elapsed time and choosing suitable units.
📗 Full lesson: Time, money and practical arithmetic
This topic comes from GayaGnan's India-wide K–12 catalog. It is not copied from, or an official chapter of, any board's textbook: check your board's syllabus for the exact chapter and depth. Open as its own page →
🖼️ 2D concept map
Tap a word to see what it means.
Clock with draggable hands showing 12-hour and 24-hour readouts together
ℹ️ Simplified clock.
🎯 Learning outcomes
Read time to the minute in 12- and 24-hour formats
Find time durations and use a calendar
Make bills and solve money problems with rupees and paise
Before you start: Clock to the hour and half hour; adding money.
📖 Explanation
An hour has 60 minutes and a day 24 hours. In the 24-hour clock, 3:45 p.m. is written 15:45. To find a duration, count on: from 9:40 a.m. to 11:15 a.m. is 20 minutes to 10:00, then 1 hour 15 minutes, total 1 hour 35 minutes.
₹1 = 100 paise. A bill lists items, quantity, rate and amount (quantity × rate); the total is the sum of amounts.
Profit is selling price − cost price when you sell for more than you paid; loss when you sell for less.
🇮🇳 Example from India
An Indian Railways timetable lists the Shatabdi leaving at 06:00 and arriving at 10:45, so the journey takes 4 hours 45 minutes.
⚠️ Common mistake
✗ 1.30 hours means 1 hour 30 minutes ✓ 1.30 hours means 1.3 hours, which is 1 hour 18 minutes; 1 hour 30 minutes is 1.5 hours.
🧪 Try this activity
Make a bill for a family grocery list: item, quantity, rate, amount and total.
✍️ Question bank with answers
Tap an option to check multiple-choice answers. Open “Answer” or “Marking points” for the others.
Multiple choice1 mark · easy
7:20 p.m. in 24-hour time is
Answer
A. 19:20
Add 12 to p.m. hours: 7 + 12 = 19.
Multiple choice1 mark · easy
How long is it from 10:50 a.m. to 1:10 p.m.?
Answer
D. 2 h 20 min
10:50 to 12:50 is 2 h, then 20 min more.
Multiple choice1 mark · easy
3 pens at ₹12.50 each cost
Answer
D. ₹37.50
12.50 × 3 = 37.50.
Very short answer1 mark · easy
How many days are there in a leap year?
Answer
366
Very short answer1 mark · easy
₹5 = ___ paise
Answer
500
Short answer2 marks · medium
A shopkeeper buys a bag for ₹400 and sells it for ₹460. Find profit or loss.
Marking points
Selling price is more
Profit = 460 − 400 = ₹60
Long answer4 marks · hard
Make a bill: 2 kg rice at ₹55/kg, 3 L oil at ₹140/L, 6 eggs at ₹7 each. Find the change from ₹1,000.
Marking points
Rice ₹110
Oil ₹420
Eggs ₹42
Total ₹572
Change ₹428
Application2 marks · medium
A school assembly starts at 8:45 and lasts 25 minutes. When does it end?
Answer
9:10
Worked problem2 marks · medium
A worker earns ₹350 a day. How much in a 26-day month?
Answer
350 × 26
₹9,100
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