Final answer:
To estimate the sum of 378,903 and 613,964, round each number to the nearest hundred thousand and then add them together, resulting in an estimated sum of 1,000,000.
Step-by-step explanation:
To estimate the sum of 378,903 + 613,964, you can round each number to its nearest hundred thousand and then add the rounded numbers together. Here is a step-by-step explanation:
Round 378,903 to the nearest hundred thousand, which is 400,000.
Round 613,964 to the nearest hundred thousand, which is 600,000.
Add the rounded numbers: 400,000 + 600,000 = 1,000,000.
So the estimated sum of 378,903 and 613,964 is approximately 1,000,000.