Mentally calculation of 21435 *11 in 5 second


Hello everybody while maybe you think it’s impossible well I am going to possible it and you will really enjoy it.
Step 1:
Take the first digit as is it which is 2
Result: 2
Step 2:
Now just add 2 and 1 which result is 3 and write this 3 after 2
Result: 23
Step 3:
Add future second and third digits which are 1 and 4 which result is 5
Result: 235
Step 4:
Add future third and forth digits, result will be 7
Result: 2,357
Add last future forth and fifth digits and result will be 8
Final result will be 23578 and take last digit as is it so our final answer is 235,785


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