CLASS – 4 MATHEMATICS
Unit – 2 : Addition
PART – A
Questions and Answers Inside the Lesson
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1. How much did Ramaiah earn on tomatoes? (Page 44)Answer: ₹ 7145
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2. How much did Ramaiah earn on potatoes? (Page 44)Answer: ₹ 2513
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3. How much money did Ramaiah earn in total from tomatoes and potatoes? (Page 44)Answer:Money from tomatoes = ₹ 7145
Money from potatoes = ₹ 2513
₹ 7145 + ₹ 2513 = ₹ 9658
Therefore, Ramaiah earned ₹ 9658 in total.
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4. How many books are available in the library? (Page 46)Answer:Books in Telugu = 2857
Books in English = 1496
2857Therefore, 4353 books are available in the library.
+ 1496
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4353
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5. How many books are available in the library? (Page 48)Answer:Number of books in Telugu = 2857
Number of books in English = 1496
2857 + 1496 = 4353
Therefore, 4353 books are available in the library.
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6. What is the purpose of the Addition Game? (Page 50)Answer: The Addition Game helps students practise making 4-digit numbers and adding them. The group with the highest total sum is the winner.
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7. What is the Group-1 total shown in the Addition Game? (Page 50)Answer:5493 + 7826
= 13,319
Therefore, the Group-1 total is 13,319. -
8. How is the winner of the Addition Game decided? (Page 50)Answer: The group with the highest total sum is declared the winner.
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9. What number does the Addition Machine always add to the number entered into it? (Page 52)Answer: 4728
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10. Will ₹10,000 be sufficient to buy the big bicycle and the small bicycle? (Page 52)Answer:Cost of big bicycle = ₹5100
Cost of small bicycle = ₹3850
₹5100 + ₹3850 = ₹8950
Since ₹8950 is less than ₹10,000, the amount is sufficient.
Therefore, ₹10,000 is sufficient.
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11. What is the estimated amount needed to buy the two bicycles? (Page 54)Answer:₹5100 rounded to the nearest thousand = ₹5000
₹3850 rounded to the nearest thousand = ₹4000
₹5000 + ₹4000 = ₹9000
Therefore, the estimated amount is ₹9000. -
12. Which pairs of train compartments have a sum greater than 8000? (Page 56)Answer:Examples of pairs whose sums are greater than 8000 are:
5329 + 1923 = 7252 — not greater than 8000
7326 + 861 = 8187 — greater than 8000
4932 + 3210 = 8142 — greater than 8000
6297 + 2134 = 8431 — greater than 8000
Therefore, suitable pairs include 7326 & 861, 4932 & 3210, and 6297 & 2134.
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13. Find the total amount collected by the village secretary. (Page 56)Answer:House Tax = ₹5960
Water Tax = ₹2398
Other Cess = ₹895
₹5960 + ₹2398 + ₹895
= ₹8358 + ₹895
= ₹9253
Therefore, the total amount collected is ₹9253.
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14. What is Anuradha's income in the month if her expenditure is ₹9385 and her savings are ₹7895? (Page 58)Answer:Expenditure = ₹9385
Savings = ₹7895
Income = Expenditure + Savings
= ₹9385 + ₹7895
= ₹17,280
Therefore, Anuradha's monthly income is ₹17,280. -
15. There are 1786 scooters in a parking place. The number of bikes is 396 more than the number of scooters. Find the number of bikes. (Page 58)Answer:Number of scooters = 1786
Bikes more than scooters = 396
Number of bikes = 1786 + 396
= 2182
Therefore, there are 2182 bikes. -
16. How many litres of water were supplied to both villages in total? (Page 58)Answer:First village = 3870 litres
Second village = 5295 litres
3870 + 5295 = 9165 litres
Therefore, 9165 litres of water were supplied in total. -
17. How many saplings were planted in schools and offices in total? (Page 58)Answer:Saplings in schools = 7365
Saplings in offices = 2859
7365 + 2859 = 10,224
Therefore, 10,224 saplings were planted in total.
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18. What is the sum of 3265 and 2678? (Page 60)Answer:3265 + 2678
= 5943 -
19. What is the total amount Srinu and Seshu have if Srinu has ₹2568 and Seshu has ₹3890? (Page 60)Answer:Srinu = ₹2568
Seshu = ₹3890
₹2568 + ₹3890 = ₹6458
Therefore, they have ₹6458 in total. -
20. What is the total population of Ramapuram village if there are 2568 males and 3890 females? (Page 60)Answer:Male population = 2568
Female population = 3890
2568 + 3890 = 6458
Therefore, the total population is 6458.
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21. What is the result of 386 + 9? (Page 62)Answer: 386 + 9 = 395
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22. Find the sum by suitable regrouping: 38 + 26 + 24 + 12. (Page 62)Answer:Regroup the numbers as:
38 + 12 + 26 + 24
= 50 + 50
= 100 -
23. Find the sum by suitable regrouping: 47 + 584 + 416 + 953. (Page 62)Answer:Regroup the numbers as:
584 + 416 + 953 + 47
= 1000 + 1000
= 2000
PART – B
End-of-Lesson Questions and Answers
EXERCISE – 1
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1. Add the following. (Page 64)Answer:a) 6976 + 3468 = 10,444
b) 8079 + 4898 = 12,977
c) 5379 + 8965 = 14,344
d) 6435 + 987 + 76 = 7498 -
2. Observe whether the following additions are correct or not. Correct them if they are wrong. (Page 64)Answer:a) 3648 + 4826 = 8474
The given answer 7464 is wrong.
b) 5017 + 3977 = 8994
The given answer 9094 is wrong.
c) 3897 + 4069 = 7966
The given answer 7856 is wrong. -
3. Write word problems for the following additions. (Page 64)Answer:a) 3268 + 5634
A school library has 3268 story books and 5634 science books. How many books are there altogether?
Answer: 3268 + 5634 = 8902 books.
b) 6240 + 5425
A farmer harvested 6240 kg of rice and 5425 kg of wheat. How many kilograms did he harvest altogether?
Answer: 6240 + 5425 = 11,665 kg. -
4. Fill in the blanks. (Page 64)Answer:a) 632 + 984 = 984 + 632
b) 2735 + 2569 = 2569 + 2735 -
5. A number is 6897 more than 5478. Find that number. (Page 64)Answer:Number = 5478 + 6897
= 12,375
Therefore, the number is 12,375. -
6. Veeraiah sold maize for ₹5397 and pearl millets for ₹3849 in a village fair. How much amount did he get? (Page 64)Answer:Maize = ₹5397
Pearl millets = ₹3849
₹5397 + ₹3849 = ₹9246
Therefore, Veeraiah got ₹9246. -
7. Madhav produced 3985 watermelons in his field. Vijayendar produced 854 more than Madhav's. What is the number of watermelons produced by Vijayendar? (Page 66)Answer:Madhav's production = 3985
More produced by Vijayendar = 854
3985 + 854 = 4839
Therefore, Vijayendar produced 4839 watermelons. -
8. In an electronics store, the prices of four fans are shown. Find the two fans whose total cost is ₹13,000. (Page 66)Answer:Fan 1 = ₹7200
Fan 2 = ₹5800
₹7200 + ₹5800 = ₹13,000
Therefore, the correct answer is A) Fan 1 and Fan 2. -
9. Which pair of numbers adds up to 400? (Page 66)Answer:120 + 270 = 390
199 + 199 = 398
150 + 190 = 340
198 + 203 = 401
None of the given options adds exactly to 400. Therefore, the question appears to contain a printing error.
PROJECT WORK – VILLAGE INFORMATION
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1. What is the total population of your village? (Page 66)Answer: Add the male population and female population.
Total population = Male population + Female population.
The exact answer depends on the village data collected. -
2. What is the sum of the total literates and illiterates? (Page 66)Answer: Total literates + Total illiterates.
The exact answer depends on the collected village data. -
3. Compare the male and female literates. (Page 66)Answer: Compare the two numbers by finding which is greater and by how much. The exact comparison depends on the village data collected.
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4. Is the sum of voters equal to the total population? What do you observe? (Page 66)Answer: The sum of voters need not be equal to the total population because not every person in the population is a voter. The exact observation depends on the collected village data.
IMPROVE YOUR LEARNING
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1. Find the values of the square and circle in the magic square. (Page 68)Answer:Each row, column and diagonal must have the same sum.
First row: 12 + 7 + 8 = 27
Second row: 5 + 9 + 13 = 27
First column:
12 + 5 + □ = 27
□ = 27 − 17
□ = 10
Third row:
10 + ● + 6 = 27
● = 27 − 16
● = 11
Therefore, □ = 10 and ● = 11. -
2. A machine adds 4728 to the number that is put in. If the final output is 6000, what number was entered? (Page 68)Answer:Entered number + 4728 = 6000
Entered number = 6000 − 4728
= 1272
Therefore, the number entered was 1272. -
3. Rafi has to add 354 and 462, but he adds 354 + 452 = 806. What should be done to correct his mistake? (Page 68)Answer:Correct sum = 354 + 462 = 816
Wrong sum = 806
Difference = 816 − 806 = 10
Therefore, he should add 10.
Correct option: a) Add 10. -
4. Which pan of the weighing balance would go down? (Page 68)Answer:Pan A:
1530 + 2435 + 1045 = 5010 g
Pan B:
2000 + 3005 = 5005 g
Since 5010 g is greater than 5005 g, Pan A would go down.
Correct option: a). -
5. In a village there are 2525 males. The number of females is 250 more than the number of males. What is the total population? (Page 68)Answer:Male population = 2525
Female population = 2525 + 250 = 2775
Total population = 2525 + 2775
= 5300
Therefore, the total population is 5300. -
6. Create a receipt for three items where the total is exactly ₹9246. One item must cost ₹5397. (Page 68)Answer:One possible receipt is:
Item 1 = ₹5397
Item 2 = ₹2000
Item 3 = ₹1849
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Total = ₹9246
₹5397 + ₹2000 + ₹1849 = ₹9246.
PART – C
Additional Questions – Based on the Lesson
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1. A school has 3485 Telugu books and 2769 English books. How many books are there altogether?Answer:3485 + 2769
= 6254
Therefore, there are 6254 books. -
2. A farmer earned ₹6850 from rice and ₹2975 from vegetables. Find his total earning.Answer:₹6850 + ₹2975
= ₹9825
Total earning = ₹9825. -
3. A library has 4275 books. It receives 1836 more books. How many books are there now?Answer:4275 + 1836
= 6111
Therefore, there are 6111 books. -
4. Estimate 4768 + 3295 by rounding both numbers to the nearest thousand.Answer:4768 rounds to 5000.
3295 rounds to 3000.
5000 + 3000 = 8000.
Estimated sum = 8000. -
5. A village collected ₹4865 as house tax, ₹2750 as water tax and ₹965 as other tax. Find the total amount collected.Answer:₹4865 + ₹2750 + ₹965
= ₹7615 + ₹965
= ₹8580.
Total amount collected = ₹8580. -
6. Add 3986 and 2457 using expanded form.Answer:3986 = 3000 + 900 + 80 + 6
2457 = 2000 + 400 + 50 + 7
= 5000 + 1300 + 130 + 13
= 6443. -
7. Find the sum by suitable regrouping: 46 + 34 + 24 + 16.Answer:46 + 34 + 24 + 16
= (46 + 34) + (24 + 16)
= 80 + 40
= 120. -
8. A shopkeeper has ₹10,000. He buys an item for ₹4250 and another for ₹3150. How much money is left?Answer:Total cost = ₹4250 + ₹3150 = ₹7400
Money left = ₹10,000 − ₹7400
= ₹2600.
PART – D
Additional Practice – MCQs, Fill in the Blanks and Concept & Thinking Questions
A. Multiple Choice Questions
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1. What is 4567 + 2345?
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2. Which number is the nearest thousand to 6490?
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3. Which pair gives a sum of 9000?
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4. What is 9999 + 1?
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5. Which statement is correct?
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6. What is 3275 + 1725?
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7. When rounding 7350 to the nearest thousand, we get:
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8. If 4728 is added to a number and the result is 7000, the number is:
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9. Which is the best regrouping for easy addition?
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10. Which of the following is an exact sum of 13,000?
B. Fill in the Blanks
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1. 3250 + 1750 = __________.
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2. 4500 + __________ = 7000.
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3. 632 + 984 = 984 + __________.
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4. 5680 rounded to the nearest thousand is __________.
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5. 3985 + 854 = __________.
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6. 4728 + 1272 = __________.
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7. 2000 + 3000 = __________.
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8. 3265 + 2678 = __________.
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9. In addition, the answer is called the __________.
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10. When numbers are added in any order, the sum remains __________.
C. Concept and Thinking Questions
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1. Rani says that 3980 + 2020 is easier to calculate than 3980 + 2019. Do you agree? Why?
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2. A shopkeeper has ₹5000. He wants to buy two items costing ₹2450 and ₹2580. Can he buy both? Explain using addition.
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3. Without doing the exact addition, estimate 4890 + 3120. Explain your method.
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4. Ravi adds 2500 + 3500 and gets 5000. Another student says the answer should be 6000. Who is correct? Explain.
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5. Can two different pairs of numbers have the same sum? Give an example and explain.
PART – D : ANSWER SHEET
A. MCQ Answers
1. B) 6912
2. C) 7000
3. A) 4500 and 4500
4. B) 10,000
5. A) 235 + 468 = 468 + 235
6. C) 5000
7. C) 8000
8. A) 2272
9. A) 38 + 12 + 26 + 24
10. A) 7200 + 5800
2. C) 7000
3. A) 4500 and 4500
4. B) 10,000
5. A) 235 + 468 = 468 + 235
6. C) 5000
7. C) 8000
8. A) 2272
9. A) 38 + 12 + 26 + 24
10. A) 7200 + 5800
B. Fill in the Blanks – Answers
1. 5000
2. 2500
3. 632
4. 6000
5. 4839
6. 6000
7. 5000
8. 5943
9. Sum
10. the same
2. 2500
3. 632
4. 6000
5. 4839
6. 6000
7. 5000
8. 5943
9. Sum
10. the same
C. Concept and Thinking – Answers
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1. Answer: Yes. 2020 is close to 2000, so 3980 + 2020 can be calculated easily as 6000.
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2. Answer: ₹2450 + ₹2580 = ₹5030. Since ₹5030 is more than ₹5000, he cannot buy both items.
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3. Answer: 4890 rounds to 5000 and 3120 rounds to 3000. Therefore, the estimated sum is 5000 + 3000 = 8000.
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4. Answer: Ravi is correct because 2500 + 3500 = 6000. Therefore, the answer is 6000.
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5. Answer: Yes. For example, 300 + 200 = 500 and 250 + 250 = 500. Different pairs can have the same sum.