Chapter 7 of 14
⬅️ Ch 6: The Junk Seller Ch 8: Carts and Wheels ➡️
NCERT Class 4 Mathematics • Classic CBSE Track

Chapter 7: Jugs and Mugs

Bunny and Banno's Wedding Feast, Capacity in Litres & Millilitres & Medical Doses | CBSE Session 2026–27

Core Pedagogical Competencies & Concepts
  • Bunny and Banno celebrate their wedding anniversary: animals drink kheer in millilitres and litres.
  • Capacity conversion: 1 Litre (l) = 1,000 Millilitres (ml).
  • Combinations that make 1 Litre: 500 ml + 500 ml; 250 ml × 4; 200 ml × 5; 100 ml × 10.
  • Estimating liquid usage: water used in bathing, cooking, washing clothes, and eye-drop droppers.
Combinations Making Exactly 1 Litre (1,000 ml) 1 LITRE 1000 ml 500 ml + 500 ml 250 ml × 4 glasses Also: 200 ml × 5 = 1000 ml | 100 ml × 10 = 1000 ml

All Textbook Exercises & In-Text Tasks (15 Questions)

100% Complete Ingestion
Q1 Bunny and Banno's Wedding Feast Arithmetic
At the wedding party: (a) 1,000 ants arrive. Each ant drinks only 1 ml of kheer. How much kheer do all 1,000 ants drink together? (b) A donkey wonders how 1,000 ants can drink kheer. 10 frogs also arrive, and each frog drinks 100 ml. How much kheer do 10 frogs drink?
[3 Marks]
✅ Step-by-Step Solution & Working
(a) Kheer for 1,000 ants:
• Each ant drinks 1 ml.
• Total kheer = 1,000 × 1 ml = 1,000 ml = 1 Litre.

(b) Kheer for 10 frogs:
• Each frog drinks 100 ml.
• Total kheer = 10 × 100 ml = 1,000 ml = 1 Litre.

Interesting observation: Both the 1,000 tiny ants and the 10 frogs drink the exact same total amount of kheer (1 Litre each!).
CBSE Step-by-Step Marking Scheme
Correct calculation for ants (1,000 ml = 1 l) 1.5 M
Correct calculation for frogs (1,000 ml = 1 l) 1.5 M
Q2 Household Water Usage & Conservation
Look at the table of water used by a family of 4 people in one day: Cooking and drinking: 30 l, Washing clothes: 40 l, Cleaning pots and pans: 20 l, Bathing: 75 l. (a) What is the total water used by the family in one day? (b) How much water will they use in 1 week (7 days)?
[3 Marks]
✅ Step-by-Step Solution & Working
(a) Total water used in 1 day:
   30 l (cooking/drinking)
+ 40 l (washing clothes)
+ 20 l (cleaning pans)
+ 75 l (bathing)
-------
165 Litres per day.

(b) Water used in 1 week (7 days):
• 165 l × 7 days = 1,155 Litres.
(Working: 100 × 7 = 700; 60 × 7 = 420; 5 × 7 = 35; 700 + 420 + 35 = 1,155 l).
CBSE Step-by-Step Marking Scheme
Correct sum of 165 Litres for 1 day 1.5 M
Accurate multiplication 165 × 7 = 1,155 Litres 1.5 M
Q3 Capacity Multiples • Bunny's Wedding Feast
At Bunny's wedding feast, 1,000 ants arrived to drink kheer. Each ant drinks only 1 mL of kheer. (a) How many millilitres of kheer do 1,000 ants drink in total? (b) Convert this quantity into litres.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Calculation:
1. Total Millilitres:
1,000 ants × 1 mL = 1,000 mL.

2. Convert to Litres:
Since 1,000 mL = 1 Litre,
1,000 mL ÷ 1,000 = 1 Litre of kheer in total.
CBSE Step-by-Step Marking Scheme
Multiplication (1,000 mL) 1.0 M
Conversion to 1 Litre 1.0 M
Q4 Water Measurement • Daily Household Usage
A family uses 6 buckets of water for bathing (each bucket holds 15 L), 3 buckets for washing clothes (each holds 20 L), and 45 L for cooking and drinking. What is the family's total daily water consumption?
[3 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Total Usage:
1. Bathing: 6 buckets × 15 L = 90 L.
2. Washing Clothes: 3 buckets × 20 L = 60 L.
3. Cooking & Drinking: = 45 L.

Total Daily Consumption:
90 L + 60 L + 45 L = 195 Litres.
CBSE Step-by-Step Marking Scheme
Bathing (90 L) and clothes (60 L) calculated 1.5 M
Grand total sum of 195 Litres 1.5 M
Q5 Building with Bricks • Brick Geometry & Measurement
A standard brick has length 20 cm, breadth 10 cm, and height 7 cm.
(a) What is the shape of a brick?
(b) What is the area of its largest face?
(c) How many bricks of 20 cm length placed end-to-end make a line 1 metre (100 cm) long?
[3 Marks]
✅ Step-by-Step Solution & Working
Brick Mathematics:
• (a) Shape: A standard brick is a cuboid.
• (b) Area of largest face: Length × Breadth = 20 cm × 10 cm = 200 square centimetres (cm²).
• (c) Number of bricks in 1 m: 1 m = 100 cm. Number of bricks = 100 ÷ 20 = 5 bricks.
CBSE Step-by-Step Marking Scheme
Cuboid shape 1 M
Area = 200 cm² 1 M
5 bricks 1 M
Q6 A Trip to Bhopal • Diesel Fuel Budget
During a school trip to Bhopal, 4 buses stop at a petrol pump to fill diesel. Each bus takes 50 litres of diesel. If 1 litre of diesel costs ₹70:
(a) How many litres of diesel are filled in total?
(b) What is the total bill amount the school must pay?
[3 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• (a) Total diesel: 4 buses × 50 L = 200 litres.
• (b) Total bill amount: 200 L × ₹70/L = ₹14,000.
CBSE Step-by-Step Marking Scheme
200 litres 1.5 M
₹14,000 bill 1.5 M
Q7 Long and Short • Height Comparisons
The world record for Men's High Jump is 245 cm and the Long Jump world record is 895 cm.
(a) Express the High Jump record in metres and centimetres.
(b) How many more centimetres are needed for the high jump record to reach exactly 2.5 metres (250 cm)?
[2 Marks]
✅ Step-by-Step Solution & Working
Calculations:
• (a) High Jump: 245 cm = 2 metres 45 centimetres.
• (b) Difference: 250 cm - 245 cm = 5 centimetres.
CBSE Step-by-Step Marking Scheme
2 m 45 cm 1 M
5 cm difference 1 M
Q8 Tick-Tick-Tick • Expiry Dates on Food
A packet of butter shows 'Manufactured: 15/01/26' and 'Best before 180 days from manufacture'. Can it be consumed safely on 15th April 2026? Explain.
[2 Marks]
✅ Step-by-Step Solution & Working
Date Verification:
• From 15th Jan to 15th April is exactly 3 months (approx. 90 days).
• Since 90 days is well within the 180-day shelf life, the butter is completely safe to consume on 15th April 2026.
CBSE Step-by-Step Marking Scheme
Time elapsed is ~90 days 1 M
Safe to consume within 180 days 1 M
Q9 The Junk Seller • Loan and Interest
Kiran took a loan of ₹300 from a bank to set up her scrap shop. She pays back ₹51 every month for six months.
(a) How much money does she pay back in total?
(b) How much extra money (interest) did she pay to the bank?
[3 Marks]
✅ Step-by-Step Solution & Working
Loan Repayment:
• (a) Total paid: 6 months × ₹51/month = ₹306.
• (b) Extra money (interest): ₹306 - ₹300 = ₹6.
CBSE Step-by-Step Marking Scheme
Total repayment = ₹306 1.5 M
Interest = ₹6 1.5 M
Q10 Jugs and Mugs • Measuring Medicine Dose
A doctor prescribes a cough syrup bottle of 150 mL for a child. The child takes a 5 mL dose three times a day.
(a) How much cough syrup does the child take in one day?
(b) For how many days will the 150 mL bottle last?
[3 Marks]
✅ Step-by-Step Solution & Working
Dosage Calculations:
• (a) Daily intake: 3 doses × 5 mL = 15 mL per day.
• (b) Days bottle lasts: 150 mL ÷ 15 mL/day = 10 days.
CBSE Step-by-Step Marking Scheme
15 mL daily 1.5 M
Bottle lasts 10 days 1.5 M
Q11 Carts and Wheels • Circle Geometry
A cyclist has a bicycle wheel with a radius of 35 cm.
(a) What is the diameter of the wheel?
(b) What is the relationship between the radius and diameter of any circle?
[2 Marks]
✅ Step-by-Step Solution & Working
Circle Properties:
• (a) Diameter: Diameter = 2 × Radius = 2 × 35 cm = 70 cm.
• (b) Relationship: The diameter is always twice the length of the radius (D = 2r), passing straight through the circle's center.
CBSE Step-by-Step Marking Scheme
Diameter = 70 cm 1 M
Formula D = 2r stated 1 M
Q12 Halves and Quarters • Fraction Sharing
Raju has ₹100. He spends 1/2 of his money on a book, and 1/4 of his total money on a pen.
(a) How much does the book cost?
(b) How much does the pen cost?
(c) How much money does Raju have left?
[3 Marks]
✅ Step-by-Step Solution & Working
Fractional Expenditure:
• (a) Book (1/2): ₹100 ÷ 2 = ₹50.
• (b) Pen (1/4): ₹100 ÷ 4 = ₹25.
• (c) Money Left: ₹100 - (₹50 + ₹25) = ₹100 - ₹75 = ₹25.
CBSE Step-by-Step Marking Scheme
Book = ₹50 1 M
Pen = ₹25 1 M
Remaining = ₹25 1 M
Q13 Play with Patterns • Secret Message Cipher
In a secret code, each letter is replaced by its position in the alphabet (A=1, B=2, C=3, ... Z=26).
Decode the secret message: '13 - 1 - 20 - 8 - 19'. What word does it spell?
[2 Marks]
✅ Step-by-Step Solution & Working
Decoding Cipher:
• 13 = M
• 1 = A
• 20 = T
• 8 = H
• 19 = S
The secret message spells MATHS.
CBSE Step-by-Step Marking Scheme
Correct decoding to spell MATHS 2 M
Q14 Tables and Shares • Division with Remainder
A florist has 58 roses. She wants to make bouquets containing 6 roses each.
(a) How many complete bouquets can she make?
(b) How many roses will be left over?
[2 Marks]
✅ Step-by-Step Solution & Working
Division:
• 58 ÷ 6 = 9 with a remainder of 4.
• (a) Complete bouquets: 9 bouquets (9 × 6 = 54 roses).
• (b) Leftover roses: 58 - 54 = 4 roses left over.
CBSE Step-by-Step Marking Scheme
9 bouquets 1 M
4 leftover roses 1 M
Q15 Review Questions • True or False
State True or False:
(a) A square has 4 equal sides and its perimeter is 4 × side.
(b) 1 kilometre equals 100 metres.
(c) Half past 4 in the afternoon is written as 16:30 in 24-hour time.
[3 Marks]
✅ Step-by-Step Solution & Working
Answers:
• (a) True: Perimeter = 4 × side.
• (b) False: 1 km = 1000 metres.
• (c) True: 4:30 PM = 12:00 + 4:30 = 16:30 hours.
CBSE Step-by-Step Marking Scheme
True, False, True with explanations 3 M
🌟 NEP 2020 Competency-Based Case Study

Hospital Intravenous (IV) Saline Bottle Rate

A hospital saline bottle holds 500 ml of fluid. A nurse sets the drip so that the patient receives 2 ml of saline every minute.

Analytical Task: How many minutes will it take for the entire 500 ml bottle to finish? Express your answer in hours and minutes.
Evaluation & Model Answer:
Step 1: Calculate total minutes:
500 ml ÷ 2 ml/min = 250 minutes.
Step 2: Convert into hours and minutes:
250 ÷ 60 = 4 with a remainder of 10.
So, 250 minutes = 4 hours and 10 minutes.
Rubric: 1 Mark for 250 minutes; 1 Mark for 4 hours 10 minutes.
⬅️ Ch 6: The Junk Seller Ch 8: Carts and Wheels ➡️