CBSE Class 5 Mathematics The Dairy Farm Worksheet Set 02

True or False

Question. Multiplying a number by 4,000 is identical to multiplying by 4 and then adding two zeros.
Answer: False
Explanation: 4,000 has three zeros, so you must multiply by 4 and add three zeros at the end.

Question. When rounding to the closest ten, if the ones digit is 5 or more, we round up.
Answer: True
Explanation: If the last digit is 5, 6, 7, 8, or 9, we always push the number up to the next ten.

Question. To approximate 325 × 18, 18 rounds to 10.
Answer: False
Explanation: 18 is closer to 20 than to 10, so it rounds up to 20.

Question. There are 86,400 seconds in one entire day.
Answer: True
Explanation: A day has 24 hours, and multiplying 24 hours by 60 minutes and 60 seconds gives 86,400 seconds.

Question. A normal year has 28 days in the month of February.
Answer: True
Explanation: In a regular non-leap year, February has exactly 28 days.

Fill in the Blanks

Question. Compute 231 by 4,000.
Answer: 9,24,000
Explanation: Multiply 231 by 4 to get 924, then write three zeros at the end to get 9,24,000.

Question. Estimate the product by rounding to the closest tens: 224 × 314 = ....................
Answer: 68,200
Explanation: Round 224 to 220 and 314 to 310, then multiply: 220 × 310 = 68,200.

Question. Multiply 153 and 800.
Answer: 1,22,400
Explanation: Multiply 153 by 8 to get 1,224, then attach two zeros at the end to get 1,22,400.

Question. Estimate the product by rounding to the nearest ten: 183 × 249 = ....................
Answer: 45,000
Explanation: Round 183 to 180 and 249 to 250, then multiply: 180 × 250 = 45,000.

Question. Estimate the result by rounding to the nearest tens: 128 × 283 = ....................
Answer: 36,400
Explanation: Round 128 to 130 and 283 to 280, then multiply: 130 × 280 = 36,400.

Question. Calculate 487 by 300.
Answer: 1,46,100
Explanation: Multiply 487 by 3 to get 1,461, then place two zeros at the end to get 1,46,100.

Question. Evaluate 105 by 7,000.
Answer: 7,35,000
Explanation: Multiply 105 by 7 to get 735, then add three zeros at the end to get 7,35,000.

Question. Estimate the product by adjusting to the nearest tens: 168 × 312 = ....................
Answer: 52,700
Explanation: Round 168 to 170 and 312 to 310, then multiply: 170 × 310 = 52,700.

Question. Multiply 1,369 with 90.
Answer: 1,23,210
Explanation: Multiply 1,369 by 9 to get 12,321, then put one zero at the end to get 1,23,210.

Question. Multiply the given numbers: 652 × 152 = ....................
Answer: 99,104
Explanation: Multiply 652 by 2, by 50, and by 100, then add the partial products to get 99,104.

Questions / Short Question Answers

Question. A bus covers a distance of 285 km every day. What distance will it travel in a year?
Answer: 1,04,025 km
Explanation: A year has 365 days. Multiply the distance covered in one day by 365: 285 × 365 = 1,04,025 km.

Question. A bag holds 125 kg of rice. How much rice will 89 such bags have?
Answer: 11,125 kg
Explanation: Multiply the weight of one bag by the total number of bags: 125 × 89 = 11,125 kg.

Question. Approximate the product of 325 and 18.
Answer: 6,000
Explanation: Round 325 to the nearest hundred (300) and 18 to the nearest ten (20). Then multiply: 300 × 20 = 6,000.

Question. How many seconds are found in a day?
Answer: 86,400 seconds
Explanation: Multiply 24 hours by 60 minutes and then by 60 seconds: 24 × 60 × 60 = 86,400 seconds.

Question. A worker can pack 575 apples in one hour and every day he works for 8 hours. How many apples will he pack in the month of February?
Answer: 1,28,800 apples
Explanation: In one day, he packs 575 × 8 = 4,600 apples. February has 28 days, so multiply 4,600 × 28 = 1,28,800 apples.

Question. 45 pupils and 6 teachers went on a day trip by train. One ticket per student cost them Rs. 175 and one ticket per teacher cost them Rs. 275. How much money they must have spent on their round trip?
Answer: Rs. 19,050
Explanation: One-way ticket cost for students is 45 × 175 = Rs. 7,875 and for teachers is 6 × 275 = Rs. 1,650. Total one-way cost is Rs. 9,525. Multiply by 2 for the round trip: 9,525 × 2 = Rs. 19,050.