Answer:
[tex]\sqrt{62} \approx 7.9[/tex]
Step-by-step explanation:
Knowing that the square of 8 is 64, that would be a good place to start. Obviously [tex]\sqrt{62} \leq 8[/tex] and it's close. Since the nearest tenth is sufficient I'd simply try with 7.9 as an estimated square root with [tex]7.9^{2} = 62.41[/tex] that's as close as you're going to get.