Add fractional decimals carefully: Find the sum of 3/10 + 5/100 + 8/1000 in decimal form.

Introduction / Context:
This question practices converting simple fractions to decimals and aligning place values for addition.

Given Data / Assumptions:

• Fractions: 3/10, 5/100, 8/1000
• Sum is requested in decimal form.

Concept / Approach:
Convert each fraction to a decimal with correct place value, then add digit by digit, keeping tenths, hundredths, and thousandths aligned.

Step-by-Step Solution:

Verification / Alternative check:
Add using thousandths: 0.300 + 0.050 + 0.008 = 0.358 exactly.

Why Other Options Are Wrong:
0.853 is a digit permutation. 3.58 and 8.35 shift the decimal point incorrectly. 0.385 is an incorrect reordering of hundredths and thousandths.

Common Pitfalls:
Failing to align decimal places and adding hundredths as tenths or vice versa.

Final Answer:
0.358