Question:
8*8=64
6+4=10 ; 1+0 =1
For this product add its digits till you get a single digit number. What this rule want to say? Please explain.
Answer:
The digit sum of a number say 152, is just the sum of the digits, 1 + 5 + 2 = 8
If the sum of the digits is greater than nine then the process is repeated.
Ex: The sum of the digits for 786 is 7 + 8 + 6 = 21 and the sum of the digits for 21 is 3
So, the digit sum of 786 is 3
This concept is known as Digit Sum Arithmetic.
In some places this concept of the digit sum of a number is also called its reduced digit sum.
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