CBSE Class 4 Maths Metric Measures HOTs

HOTS

1. Ravi got 80 candies for his daughter’s birthday. Each candy weighed 50 g. If price of candies was ₹10 per kg, how much did he pay?
Answer: ₹ 40

2. A cake recipe calls for 1/10 l of chocolate syrup and 1/4 l of milk. How many millilitres of syrup and milk are there altogether? How many more millilitres of milk are there than the syrup?
Answer: 350ml , 150ml

3. Ajay. Abhishek, Pankaj and Manoj wanted to have their weights measured on a scale. Abhishek weighed 62295 g. Ajay weighed 5 kg 34 g more than Pankaj but 4 kg 709g less than Manoj. The total weight of Pankaj and Abhishek was 130 kg. Find the weight of Ajay, Abhishek, Pankaj and Manoj in kg and g.
Answer: Ajay=72 kg 739g, Abhishek = 62kg 295g, Pankaj = 67kg 705g, Manoj = 77kg 448g

4. A bucket can contain 10l water. A mug can contain 1l 250ml water. 2 mugs full of water are poured into the empty bucket. How much more water should be poured into the bucket to make it full?
Answer: 7 l 500ml

SUMMARY

1. The system of measurement for length, mass and capacity is called the metric system.

2. The standard units of length, mass and capacity are metre, gram and litre.

3. The common prefixes used to denote different units are milli, centi, deci, deca, hecto and kilo.

4. To convert a smaller unit to a higher unit, divide by 10, 100, 1000, ..........

5. To convert a larger unit to a smaller unit, multiply by 10, 100, 1000, .........

ERROR ANALYSIS

1. Students make mistakes in conversion of units. For example, to convert from lower to higher units, they multiply and similarly to convert from higher to lower units, they divide.

2. While doing addition and subtraction of metric system, they make mistakes in placement of digits.

ACTIVITY I

To understand the conversion of units.
Procedure: Distribute coins of different denominations among the students.
1. Now ask the students to measure the diameter of the coins of different denominations to the nearest mm.
2. Convert mm into cm.
3. Record the data in a table.

ACTIVITY II

Chandigarh and Amritsar
Distance (in km) between locations of Punjab is shown below.  

Observing the above routes answer the following.
1. Find the total distance required to be covered if a person travelled from Chandigarh to Amritsar.
2. What is distance between Firozpur and Atari?
3. From Ludhiana, which place is nearer:
a. Rajpura or Hoshiarpur?
b. Chandigarh or Amritsar?
c. Patiala or Atari?
d. Atari or Chandigarh?
e. Batala or Chandigarh?