Samacheer Kalvi Class 4 Maths Solutions Term 3 Chapter 3 Measurements Exercise 3.1

Tamilnadu Samacheer Kalvi 4th Maths Solutions Term 3 Chapter 3 Measurements Ex 3.1

Question 1. Rani had 1 litre coconut oil. She shared it equally among her 5 friends. How much does each person have?
Answer: First, we convert the total oil from litres to millilitres.
\( 1 \text{ litre} = 1000 \text{ ml} \)
Then, we share this amount equally among 5 friends.
\( 1000 \text{ ml} \div 5 = 200 \text{ ml} \)
So, each person receives 200 ml of coconut oil.
In simple words: Rani had 1000 ml of oil. She split it evenly among 5 friends, so each friend got 200 ml.

🎯 Exam Tip: Always remember to convert units to the same measurement (like litres to millilitres) before performing calculations like sharing or adding.

Question 2. A teapot contains 2 litres, it is poured in cups with a capacity of 500 ml. How many cups can be filled?
Answer: First, we convert the total volume of tea from litres to millilitres.
\( 1 \text{ litre} = 1000 \text{ ml} \)
So, \( 2 \text{ litres} = 2 \times 1000 = 2000 \text{ ml} \)
Next, we divide the total volume by the capacity of one cup to find out how many cups can be filled.
\( 2000 \text{ ml} \div 500 \text{ ml/cup} = 4 \text{ cups} \)
Therefore, 4 cups can be filled from the teapot. Each cup holds exactly half a litre.
In simple words: The teapot holds 2000 ml of tea. Since each cup holds 500 ml, you can fill 4 cups.

🎯 Exam Tip: When dealing with different units, always convert them to the smaller unit (e.g., litres to millilitres) to avoid errors in division or multiplication.

Question 3. Ram has 1 litre of juice bottle if he gives his friend 100 ml of juice. How much is left with him?
Answer: First, convert the initial amount of juice from litres to millilitres.
\( 1 \text{ litre} = 1000 \text{ ml} \)
Then, subtract the amount of juice Ram gave to his friend.
\( 1000 \text{ ml} - 100 \text{ ml} = 900 \text{ ml} \)
So, 900 ml of juice is left with Ram. Sharing juice is a kind act!
In simple words: Ram started with 1000 ml of juice. He gave away 100 ml, so 900 ml was left.

🎯 Exam Tip: Ensure that all quantities are in the same unit before performing addition or subtraction, as mixing units can lead to wrong answers.

Question 4. Change litre into millilitre.
1. \( 1l = \text{____ ml} \)
2. \( 7l = \text{____ ml} \)
3. \( 5l = \text{____ ml} \)
4. \( 9l = \text{____ ml} \)
5. \( 4l = \text{____ ml} \)
Answer:
1. \( 1l = 1 \times 1000 = 1000 \text{ ml} \)
2. \( 7l = 7 \times 1000 = 7000 \text{ ml} \)
3. \( 5l = 5 \times 1000 = 5000 \text{ ml} \)
4. \( 9l = 9 \times 1000 = 9000 \text{ ml} \)
5. \( 4l = 4 \times 1000 = 4000 \text{ ml} \)
In simple words: To change litres into millilitres, you just need to multiply the number of litres by 1000, because one litre is always equal to 1000 millilitres. This is a standard conversion for liquid measurements.

🎯 Exam Tip: Remember that 1 litre always equals 1000 millilitres; knowing this conversion factor is key for these types of questions.

Question 5. Change millilitre into litre.
1. \( 6000 \text{ ml} = \text{____ l} \)
2. \( 2000 \text{ ml} = \text{____ l} \)
3. \( 8000 \text{ ml} = \text{____ l} \)
4. \( 9000 \text{ ml} = \text{____ l} \)
Answer:
1. \( 6000 \text{ ml} = 6 \text{ litres} \) (Since \( 6000 \div 1000 = 6 \))
2. \( 2000 \text{ ml} = 2 \text{ litres} \) (Since \( 2000 \div 1000 = 2 \))
3. \( 8000 \text{ ml} = 8 \text{ litres} \) (Since \( 8000 \div 1000 = 8 \))
4. \( 9000 \text{ ml} = 9 \text{ litres} \) (Since \( 9000 \div 1000 = 9 \))
In simple words: To change millilitres into litres, you need to divide the number of millilitres by 1000, because 1000 millilitres make one litre. It's the reverse of changing litres to millilitres.

🎯 Exam Tip: When converting from a smaller unit (millilitre) to a larger unit (litre), always perform division by the conversion factor (1000).