To find the value that completes the sentence "40 is 10 times as much as [tex]$\square$[/tex]," we start by recognizing that we need a number which, when multiplied by 10, equals 40.
Here’s the process to find this number:
1. Let's call the unknown value [tex]\( x \)[/tex].
2. According to the problem, 40 is 10 times [tex]\( x \)[/tex]. Mathematically, this is represented as:
[tex]\[
40 = 10 \times x
\][/tex]
3. To solve for [tex]\( x \)[/tex], we need to isolate [tex]\( x \)[/tex] on one side of the equation. We do this by dividing both sides of the equation by 10:
[tex]\[
x = \frac{40}{10}
\][/tex]
4. Performing the division gives us:
[tex]\[
x = 4.0
\][/tex]
Hence, the sentence completes as:
40 is 10 times as much as [tex]\( \boxed{4} \)[/tex].