1. The problem asks to write the number 0.00654 in standard form. 2. Standard form (also called scientific notation) expresses a number as $a \times 10^n$ where $1 \leq |a| < 10$ and $n$ is an integer. 3. To convert 0.00654, move the decimal point to the right until only one non-zero digit remains to the left of the decimal. 4. Moving the decimal 3 places right: $0.00654 = 6.54 \times 10^{-3}$. 5. The exponent is negative because we moved the decimal to the right (for numbers less than 1). 6. Therefore, the standard form of 0.00654 is $6.54 \times 10^{-3}$.