Samacheer Kalvi Class 4 Maths Solutions Term 1 Chapter 4 Measurements Exercise 4.2

Add the Following

 

Question 1.
m cm
41 29
+ 26 75
Answer: We need to add the measurements in meters and centimeters. First, add the centimeters: \( 29 \text{ cm} + 75 \text{ cm} = 104 \text{ cm} \). Since there are 100 cm in 1 meter, 104 cm is equal to 1 meter and 4 cm. Now, carry over the 1 meter to the meters column. Then, add the meters: \( 41 \text{ m} + 26 \text{ m} + 1 \text{ m} \) (from the carry-over) \( = 68 \text{ m} \). So, the total is 68 m and 04 cm. This type of column addition helps keep track of different units accurately.

The total sum is 68 m 04 cm.
In simple words: First, add the centimeters. If they are more than 100, change 100 cm into 1 meter and carry it over. Then, add the meters.

🎯 Exam Tip: Always remember the conversion factor of 100 cm = 1 m when adding measurements to correctly handle carry-overs.

 

Question 2.
m cm
70 23
+ 31 45
Answer: To add these measurements, first add the centimeter values: \( 23 \text{ cm} + 45 \text{ cm} = 68 \text{ cm} \). Since 68 cm is less than 100 cm, there is no meter to carry over. Next, add the meter values: \( 70 \text{ m} + 31 \text{ m} = 101 \text{ m} \). Therefore, the total sum is 101 meters and 68 centimeters. Adding units separately like this helps to organize the calculation clearly.

The total sum is 101 m 68 cm.
In simple words: Add the centimeters first. If the sum is less than 100, keep it. Then, add the meters.

🎯 Exam Tip: When the sum of centimeters is less than 100, there is no need to carry over to the meters column, simplifying the addition.

 

Question 3.
m cm
35 08
+ 29 26
Answer: Let's add the measurements step by step. First, sum the centimeter values: \( 08 \text{ cm} + 26 \text{ cm} = 34 \text{ cm} \). This is less than 100 cm, so no meters are carried over. Next, sum the meter values: \( 35 \text{ m} + 29 \text{ m} = 64 \text{ m} \). The final result is 64 meters and 34 centimeters. Always start adding from the smallest unit, which is centimeters in this case.

The total sum is 64 m 34 cm.
In simple words: Add the centimeters together. Then, add the meters together. If centimeters are less than 100, you don't carry anything.

🎯 Exam Tip: When adding mixed units, always ensure you sum the values in each unit column separately before considering any carry-overs.

 

Question 4.
m cm
53 45
+ 34 68
Answer: Let's add the given measurements. First, add the centimeters: \( 45 \text{ cm} + 68 \text{ cm} = 113 \text{ cm} \). Since \( 100 \text{ cm} = 1 \text{ m} \), 113 cm can be written as 1 m and 13 cm. Now, we carry over the 1 meter to the meters column. Next, add the meters: \( 53 \text{ m} + 34 \text{ m} + 1 \text{ m} \) (the carried-over meter) \( = 88 \text{ m} \). So, the final total is 88 meters and 13 centimeters. Remember that the carry-over from centimeters to meters is based on 100, not 10.

The total sum is 88 m 13 cm.
In simple words: Add centimeters first. If the sum is more than 100 cm, take 100 cm as 1 meter and add it to the meter column. Write down the remaining centimeters. Then, add all the meters.

🎯 Exam Tip: Always be careful when the sum of the smaller units (like cm) exceeds their base unit (100 cm in this case), as it requires a carry-over to the larger unit (m).

 

Question 5.
m cm
51 30
+ 21 12
Answer: Let's find the total of these measurements. First, add the centimeters: \( 30 \text{ cm} + 12 \text{ cm} = 42 \text{ cm} \). This sum is less than 100 cm, so we don't carry any meters over. Next, add the meters: \( 51 \text{ m} + 21 \text{ m} = 72 \text{ m} \). Therefore, the combined measurement is 72 meters and 42 centimeters. This method of adding each unit type separately helps keep calculations simple and accurate.

The total sum is 72 m 42 cm.
In simple words: First, add the centimeters together. If the answer is below 100, leave it as is. Then, add the meters.

🎯 Exam Tip: For simple additions where no carry-over is needed between units, treat each unit column as a separate addition problem.

 

Question 6.
m cm
60 45
+ 24 75
Answer: Let's calculate the total. First, add the centimeters: \( 45 \text{ cm} + 75 \text{ cm} = 120 \text{ cm} \). Since \( 100 \text{ cm} = 1 \text{ m} \), 120 cm is equivalent to 1 m and 20 cm. Carry over the 1 meter to the meters column. Next, add the meters: \( 60 \text{ m} + 24 \text{ m} + 1 \text{ m} \) (from the carry-over) \( = 85 \text{ m} \). So, the final sum is 85 meters and 20 centimeters. This process is like regular addition but with an extra step for unit conversion.

The total sum is 85 m 20 cm.
In simple words: Add centimeters first. If the sum is 100 cm or more, convert 100 cm into 1 meter and add it to the meter column. Write down the rest of the centimeters. Then, add all the meters together.

🎯 Exam Tip: Always double-check your centimeter addition for values over 99, as this is where carry-overs to the meter unit are often missed.