Samacheer Kalvi Class 4 Maths Solutions Term 2 Chapter 4 Measurements Exercise 4.2

Chapter 4

Question 1. Mohana bought 2 kg 600 g grapes and 1 kg 450 g grapes. How much more did Mohana buy grapes than grapes, by weight?
(a) 150 g
(b) 1 kg 150 g
(c) 1 kg 200g
(d) 4kg
Answer: (b) 1 kg 150 g
In simple words: First, convert all weights to grams. Then, subtract the smaller weight from the larger weight to find the difference. This difference shows how much more Mohana bought.

🎯 Exam Tip: Always make sure units are the same (like all grams or all kilograms) before performing addition or subtraction with weights. Remember 1 kg = 1000 g for calculations.

Question 2. Put >, < or = in the boxes provided below.
(i) 50 g ______ 340 g
Answer: 50 g \( \le \) 340 g
(ii) 640 g ______ 800 g
Answer: 640 g \( \le \) 800 g
(iii) 34 kg ______ 22 kg
Answer: 34 kg \( > \) 22 kg
(iv) 1000 g ______ 1 kg
Answer: 1000 g \( = \) 1 kg
In simple words: We compare the given weights to see if one is bigger, smaller, or equal to the other. Remember that 1000 grams is the same as 1 kilogram, which helps in comparing different units.

🎯 Exam Tip: When comparing weights, always ensure both sides are in the same unit (e.g., both grams or both kilograms) to avoid mistakes. Convert to the smaller unit for easier comparison if needed.

Question 3. Add:
Answer:
(i)

🎯 Exam Tip: Pay close attention to carrying over when adding grams, as 1000 g makes 1 kg. This is crucial for getting the correct final answer.

Question 4. Subtract:
Answer:
(i)

🎯 Exam Tip: When borrowing from the kilogram column, always remember that 1 kg converts to 1000 g. This conversion is vital for correct subtraction.

Question 4. The weights of three babies are respectively 3 kg 650 g, 5 kg 420 g and 4 kg 750 g. Find their total weight?
Answer: First, write down the weight of each baby.
Weight of 1st Baby = 3 kg 650 g
Weight of 2nd Baby = 5 kg 420 g
Weight of 3rd Baby = 4 kg 750 g
Then, add all these weights to find the total.
Total weight = 3 kg 650 g + 5 kg 420 g + 4 kg 750 g
We can add them using a column method:

🎯 Exam Tip: When adding multiple weights, ensure you align the kg and g columns correctly and remember to carry over 1 kg for every 1000 g.

Question 5. A shopkeeper had 275 kg 450 g of coffee powder. He sold 80 kg 475 g. How much coffee powder left?
Answer: First, note down the total amount of coffee powder the shopkeeper had and the amount he sold.
Weight of coffee powder the shopkeeper had = 275 kg 450 g
Weight of coffee powder he sold = 80 kg 475 g
To find out how much coffee powder is left, we need to subtract the amount sold from the initial amount. We perform the subtraction using a column method:

🎯 Exam Tip: When subtracting, if the grams to be subtracted are more than the grams available, borrow 1 kg from the kilograms column and add 1000 g to the grams column before subtracting.