Final answer:
To estimate the sum of 3.4 and 2.7, round each to the nearest whole number and add to get 6. The exact sum is calculated by adding the two numbers to get 6.1.
Step-by-step explanation:
To estimate the sum of 3.4 + 2.7, you can round each number to the nearest whole number and then add those rounded numbers together. In this case, 3.4 rounds down to 3, and 2.7 rounds up to 3, giving us an estimated sum of 3 + 3 = 6.
To find the exact sum, we add the two given numbers: 3.4 + 2.7 = 6.1. This is a simple addition of decimals, where you align the decimal points and add the digits in each place value, similar to how you would add whole numbers.