Question

round 18.6404 to the tenths place value.

18.6404 rounded to the tenths place is

Explanation:

Identify the tenths digit

$$ \text{In } 18.6404\text{, the tenths digit is } 6. $$

Examine the hundredths digit

$$ \text{The digit to its right is } 4. $$

Apply rounding rules

$$ 4 < 5 \implies \text{round down} \implies 18.6 $$

Answer:

Round 18.6404 to the tenths place value.

18.6404 rounded to the tenths place is <blank>18.6</blank>.