Level
1

1000 square rooted is
**
_
**
.

31.62277660...
22.559966772...
35.277660055440...
27.669922330...

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1000 is close to 1024, which is $2^{10}$ or $(2^5)^2$ $\sqrt{1000}\approx\sqrt{1024}=\sqrt{(2^5)^2}=2^5=32$ $\therefore \sqrt{1000}$ must be slightly less than 32. The only option slightly less than 32 is 31.62277660...