Question 1: Round 2,347 to the nearest 100.

Answer: 2300

Question 2: Round 9,856 to the nearest 100.

Answer: 9600

Question 3: Round 15,499 to the nearest 100.

Answer: 15500

Question 4: What is 76,432 rounded to the nearest 100?

Answer: 76,400

Question 5: Estimate the total of 124,678 and 83,492 by rounding each to the nearest 100, then add.

Answer: 124,700 + 83,500 = 208,200

Question 6: A population of a town is 56,789. After a year, it increases by approximately 10,000. Round the new population to the nearest 1000.

Answer: 66,789 rounded to 67,000

Question 7: Construct a rectangle on the grid with length approximately 4,350 and width approximately 2,250, both rounded to the nearest 100.

Answer: length: 4300, width: 2300

Question 8: Identify and correct the mistake: '2500 rounded to the nearest 100 is 2600.'

Answer: Incorrect; 2500 rounded to nearest 100 is 2500

Question 9: Compare 3,457,890 and 3,459,120 by rounding each to the nearest 100, then explain which is larger and why.

Answer: 3,457,890 rounds to 3,457,900; 3,459,120 rounds to 3,459,100; so the second is larger because 3,459,100 > 3,457,900.

Question 10: Estimate the total cost of items priced at 1,245 and 2,678 by rounding to the nearest 100 and then adding.

Answer: 1200 + 2700 = 3900

Question 11: A factory produces 123,456 units in a year. Round this to the nearest 1000 and explain your reasoning.

Answer: 123,456 rounded to 123,000 because the hundreds digit is 4, less than 5.