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Find the cube root of 4 741632 by estimation |
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Answer» hello dear friend, so, the no. you have got is 4741632. okay first determine total digits in the number, then start the estimation of grouping. nos. 1 to 3 give us cubes of 1-digit.then, nos. 4 gives us cubes of 2-digits similarly, no. from 5 to 9 give us cube of 3-digits. then, nos. from 10 to 21 give us cube of 4-digits. & nos. from 22 to 46 give us cube of 5-digits. & nos. from 47 to 99 give us cube of 6-digits. at last ,nos. from 100 to 215 give us cube of 7-digits. so we can find that according to your question your number is a 7-digit no. this MEANS it is having the cube root as a 3-digit number . the unit's digit is 2, and only the nos. ending with 8 produce cubes ending with 2. thus, the numbers can be either of from: 108, 118, 128, 138, 148, 158, 168, 178, 188, or 198. the number you want is 4741632 , so if we collectively go to the middle nos, and not FOCUS from first to last, we can calculate , the cube of 150 BECOMES 3375000 & that of 160 is 4096000. going on to 170 's cube is 4913000.(nearly close to 4741632) by this u should opt for no. 168 which has nearly close to cube no. of the given and calculating: 168 x 168 x 168 = 4741632 hence , by estimation , the result is 168 (required answer) hope this helps !! thanks & goodluck !! |
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