Using estimation, find 3√91125. Group: 91 | 125. The number ends in 5 (root ends in 5). For 91, largest cube

Question

Using estimation, find 3√91125. Group: 91 | 125. The number ends in 5 (root ends in 5). For 91, largest cube <= 91 is 64 = 4^3, so tens digit 4.

Accepted Answer

45. Units 5 (cube ends in 5 -> root ends in 5), tens 4 (4^3=64 <= 91 < 125=5^3). 3√91125 = 45, and 45^3 = 91125.

Using estimation, find $391125$ .
Group: 91 | 125. The number ends in 5 (root ends in 5). For 91, largest cube <= 91 is $64 = 4^{3}$ , so tens digit 4.