CBSE Class 3 Mathematics Revision Worksheet Set 03

Q3. Fill in the blanks so that both sides become equal.

a) 2 \(l\) = 1000 ml + 1000 ml
Answer: Since 1 \(l\) = 1000 ml, therefore 2 \(l\) = 2000 ml = 1000 ml + 1000 ml.
In simple words: Convert litres to millilitres by multiplying by 1000.

Exam Tip: Always remember the standard conversion: 1 litre = 1000 millilitres.

b) 1 Kg = 500 g + 500 g
Answer: Since 1 Kg = 1000 g, we can split it into 500 g and 500 g.
In simple words: 1 kilogram is equal to 1000 grams.

Exam Tip: 1 Kg = 1000 g is a fundamental conversion used in weight measurements.

c) 200 ml + 800 ml = 1000 ml
Answer: 200 + 800 = 1000 ml
In simple words: Add the given millilitre values directly.

Exam Tip: Check that the units on both sides of the equation are the same before adding.

d) 100 ml + 900 ml = 1000 ml
Answer: 1000 - 100 = 900 ml
In simple words: Find the missing number that adds up to 1000.

Exam Tip: Use subtraction to find a missing addend in an equation.

e) 4 kg 700 g = 4700 g
Answer: 4 kg = 4000 g
4000 g + 700 g = 4700 g
In simple words: Convert kilograms to grams and add the remaining grams.

Exam Tip: To convert kg and g to only g, multiply the kilograms by 1000 and add the grams.

Q3. Match the time.
Answer:
a) 3:45 matches with quarter to 4
b) 10:30 matches with half past ten
c) 4:40 matches with 20 minutes to 5
d) 9:15 matches with quarter past 9
e) 7:45 matches with quarter to eight (Note: Adapted from standard time matching logic based on options provided)
In simple words: Match digital time formats with their word descriptions.

Exam Tip: 45 minutes past the hour is also called quarter to the next hour.

Q4. Name two-
a) months having 30 days.
Answer: April, June (or September, November)
In simple words: Write any two months from the calendar that have exactly 30 days.

b) months ending with -ber
Answer: September, October (or November, December)
In simple words: Choose months whose names end with the letters b-e-r.

Exam Tip: The last four months of the year all end with -ber.

Q5. Sahil sold 20 kg 700 g wheat and 36 kg 600 g rice. Which item did he sell more and how much more?
Answer:
Quantity of rice sold = 36 kg 600 g
Quantity of wheat sold = 20 kg 700 g
Comparing the weights, 36 kg 600 g is greater than 20 kg 700 g, so he sold more rice.
To find how much more, subtract the weight of wheat from the weight of rice:
Step 1: Subtract grams (borrow 1 kg = 1000 g if needed)
\(600\text{ g}\) is smaller than \(700\text{ g}\), so borrow 1 kg from 36 kg.
New weight of rice = 35 kg 1600 g
Weight of wheat = 20 kg 700 g
Difference in grams = \(1600 - 700 = 900\text{ g}\)
Difference in kilograms = \(35 - 20 = 15\text{ kg}\)
Difference = 15 kg 900 g
In simple words: Subtract the smaller weight from the larger weight after comparing them.

Exam Tip: Always arrange kilograms under kilograms and grams under grams before subtracting, borrowing 1000 g when necessary.

Q6. A jar contains 2 \(l\) 150 ml of juice, 3 \(l\) 680 ml more of juice was added to it. How much juice is there in the jar now?
Answer:
Initial quantity of juice = 2 \(l\) 150 ml
Juice added = 3 \(l\) 680 ml
Total juice = Initial quantity + Juice added
Adding millilitres: \(150\text{ ml} + 680\text{ ml} = 830\text{ ml}\)
Adding litres: \(2\text{ }l + 3\text{ }l = 5\text{ }l\)
Total quantity in the jar = 5 \(l\) 830 ml
In simple words: Add litres together and millilitres together to find the total quantity.
Exam Tip: If the sum of millilitres exceeds 1000 ml, convert 1000 ml into 1 litre and carry it over to the litre column.

Q7. Mayank goes to school by bus. It takes 30 minutes to reach school from his home. His bus starts at 7:30 am. What time does he reach the school?
Answer:
Starting time of the bus = 7:30 am
Time taken to reach school = 30 minutes
Reaching time = 7:30 am + 30 minutes
\(30\text{ minutes} + 30\text{ minutes} = 60\text{ minutes}\) (which is 1 hour)
\(7:00\text{ am} + 1\text{ hour} = 8:00\text{ am}\)
Mayank reaches school at 8:00 am.
In simple words: Add 30 minutes to 7:30 am to get 8:00 am.

Exam Tip: When minutes reach 60, add 1 to the hour and reset the minutes to 00.

Q8. Arrange and find the sum.

a) 130 kg 600 g and 245 kg 20 g
Answer:
Arrange in columns of kg and g:
130 kg 600 g
+ 245 kg 020 g
--------------------
Sum of grams: \(600 + 20 = 620\text{ g}\)
Sum of kilograms: \(130 + 245 = 375\text{ kg}\)
Total sum = 375 kg 620 g
In simple words: Add the grams together and the kilograms together.

Exam Tip: Always make sure grams have three digits (e.g., 20 g becomes 020 g) before adding vertically.

b) 180 \(l\) 40 ml and 15 \(l\) 40 ml
Answer:
Arrange in columns of litres and millilitres:
180 \(l\) 040 ml
+ 15 \(l\) 040 ml
--------------------
Sum of millilitres: \(40 + 40 = 80\text{ ml}\) (or 080 ml)
Sum of litres: \(180 + 15 = 195\text{ }l\)
Total sum = 195 \(l\) 80 ml
In simple words: Add litres to litres and millilitres to millilitres.

Exam Tip: Keep millilitres written with three digit places (040 ml) to prevent addition placement errors.