Final answer:
Use front-end estimation by rounding each number to the nearest ten and then adding those numbers. The estimated sum of 48.1, 29.7, and 11.8 using this method is 90.
Step-by-step explanation:
The question asks to estimate the sum using front-end estimation for the numbers 48.1, 29.7, and 11.8. Front-end estimation involves using the leading digits of each number to make an estimation. To do this, we round each number to the nearest ten (ignoring the decimal part) and then add those rounded numbers together. For 48.1, we consider 50; for 29.7, we consider 30; and for 11.8, we consider 10. Adding these up, we get an estimated sum of 50 + 30 + 10, which equals 90. Therefore, the answer is B) 90.
To estimate the sum using front-end estimation, we round each number to the nearest ten and then add them up. In this case, 48.1 rounds to 50, 29.7 rounds to 30, and 11.8100809070 rounds to 10. So, the estimated sum is 50 + 30 + 10 = 90.