Question 1: Calculate the sum of 12,345 + 23,456.

Answer: 35,801

Question 2: Add the numbers 107,654 and 89,321.

Answer: 196,975

Question 3: Find the total of 999,999 + 123,456.

Answer: 1,123,455

Question 4: What is 250,000 plus 750,000?

Answer: 1,000,000

Question 5: Calculate 456,789 + 123,456.

Answer: 580,245

Question 6: Solve: 1,234,567 + 876,543.

Answer: 2,111,110

Question 7: A company's revenue this year is $3,456,789. Next year, it increases by $1,234,567. What is the new total?

Answer: 4,691,356

Question 8: A warehouse has 987,654 items. It receives a shipment of 123,456 items. How many items are now in the warehouse?

Answer: 1,111,110

Question 9: Add the numbers 999,999,999 + 1.

Answer: 1,000,000,000

Question 10: Estimate the sum of 4,567,891 + 3,210,987 by rounding to the nearest million.

Answer: 8,000,000

Question 11: Identify and correct the mistake: 123,456 + 78,901 = 202,357.

Answer: The correct sum is 202,357; the calculation is correct, so no mistake. If students identify the mistake, they should explain that the sum is correct or state the correct addition.

Question 12: Challenge: Find the sum of 9,876,543 + 2,345,678 + 7,654,321.

Answer: 19,876,542