#tapan Find out the cube root of 50653. Here is how to solve this question. The first step is to divide the number into 2 parts by separating the last 3 digits. So, we get 50 & 563 as the two parts of the number. Now, take the first part and find the largest cube contained in the first part i.e. in 50 = 27 (which is the cube of 3). The next cube i.e. 64 (cube of 4) is larger than 50. Now, as 27 is the cube of 3, your ten’s part of cube root would be 3. [This is why we memorized the cubes] The next step is to take the last digit of the number, which in this case is 3.Which number’s cube had 3 as the unit digit? 7… right?? (7*7*7=34 3) Hence, 7 is the unit digit of your solution. [This is why we memorized the endings] So, your answer is 37. Try cubing 37 on a calculator to verify your answer. Let us solve another example to show how the answer can be achieved in less than 5 seconds.... ........ Calculate the cube root of 941192. By Step 1 —– We get two parts i.e. 941 and 192. By Step 2 —– The largest cube less than 941 is 729 (cube of 9). So, ten’s digit is 9. By Step 3 —– The ending digit is 2. Hence, unit’s digit is 8. That’s it. 98 is the answer.
Posted on: Fri, 10 Oct 2014 04:27:33 +0000
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