In math the tricks are like 'Lift' with which you can go up without any hardwork.
Todat sessions we will discuss about the cuberoots of cubes.
I think everyone know the follow table
Note:If you have not remembered the just remember its unit digit.
We will be solving the cube root in 2 parts. First, we shall solve the right hand part of the answer and then we shall solve the left hand part of the answer. If you wish you can solve the left hand Part Before the right hand part. There is no restriction on either method but generally people prefer to solve the right hand part first.
Q. Find the cuberoot of 287496?
A.
• We shall represent the number 287496 as 287 496
• Next, we observe that the cube 287496 ends with a 6 and we know that when the cube ends with a
6, the cube root also ends with a 6. Thus our answer at this stage is ___6. We have thus got the right hand part of our answer.
• To find the left hand part of the answer we take the number which lies to the left of the slash.
In this case, the number lying to the left of the slash is 287. Now, we need to find two perfect cubes between which the number 287 lies in the number line. From the key, we find that 287 lies between
the perfect cubes 216 (the cube of 6) and 343 (the cube of 7).
• Now, out of the numbers obtained above, we take the smaller number and put it on the left hand part of the answer. Thus, out of 6 and 7, we take the smaller number 6 and put it beside the answer of __6 already obtained. Our final answer is 66. Thus, 66 is the cube root of 287496.
Note: You Should always break the number by 3,3,... digit.
Q. Find the cuberoot of 2197?
A.
The number 2197 will be represented as 2 197
• The cube ends in 7 and so the cube root will end with a 3.
We will put 3 as the right hand part of the answer.
• The number 2 lies between 1 (the cube of 1) and 8 (the cube of 2)
• The smaller number is 1 which we will put as the left hand part of the answer. The final answer is
13.
Thanks For Reading This Blog.
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