How to find out the square root and cube root of a number wi

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How to find out the square root and cube root of a number with out a calculator?
Give me an easy way.

我记得上初中的时候,老师曾经教过笔算开平方法求一个数的平方根,（它的原理就是利用平方和公式倒推）,至于手工计算立方根好像没有学过.对于被开方数不大的数有个简便的办法(不借助计算工具）就是手工凑,比如说要求58的平方根,7的平方为49,而8的平方为64,故58的平方根肯定是位于7到8之间,再经过试算,7.6的平方为57.56,而7.7的平方为59.29,可以肯定58的平方根处于7.6到7.7之间,这样凑下去可以得到精确到小数点后面两位数字：7.61
因为英语水平有限,只能用中文解答!

How to find out the square root and cube root of a number wi .The square root of the product of 4 and a number is 6,what 翻译成中文the cube of the square root of one-fourth the square of the square of the cube root of M 的中文意思一道英文物理课上的题～Use your calculator to find the square root of 8. Find the difference quotient for a f(x) = square root of (x- for what positive number the square root of the number the s 1.for what positive number is the square root of the number three equal to square root of nine, cube function; square root function; cube roof function 是什么函英语翻译Estimate and find each square root to 2 decimal places u the root mean square error