Question 1: Round 7,845,273,459 to the nearest 1000.

Answer: 7,845,273,000

Question 2: Calculate the rounded value of 123,456,789,012 to the nearest 1000.

Answer: 123,456,789,000

Question 3: Round 999,999,999,999 to the nearest 1000.

Answer: 1,000,000,000,000

Question 4: Estimate 5,678,912,345,678 rounded to the nearest 1000, then explain why your estimate is accurate.

Answer: 5,678,912,346,000; Because 678 rounds up to 1,000, adding the extra 1,000 to the previous thousand value.

Question 5: Identify and correct the common mistake: Rounding 2,345,679,123,456 to 2,345,679,123,000.

Answer: Incorrect; the correct rounded value is 2,345,679,123,000 because the last three digits are 456, which rounds down to 000.

Question 6: Plot the point representing 456,789,123,456 on the grid, then round it to the nearest 1000 and mark the rounded value as well.

Answer: 456,789,123,000

Question 7: Construct a number greater than 1,000,000,000,000 that rounds to 1,000,001,000,000 when rounded to the nearest 1000.

Answer: 1,000,000,000,500 or any number from 1,000,000,000,500 to 1,000,001,000,499

Question 8: A company reports their revenue as 78,900,045,678,123. Round this to the nearest 1000 for a summary report.

Answer: 78,900,045,678,000

Question 9: Explain the significance of rounding very large numbers in scientific or financial contexts.

Answer: Rounding simplifies data, making it easier to interpret large figures in scientific measurements or financial reports, and reduces computational errors.

Question 10: Using the number 9,999,999,999,999, round it to the nearest 1000 and justify your answer.

Answer: 10,000,000,000,000; because the last three digits are 999, which rounds up to 1,000, making the total increase by 1,000.