The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 1152.
1152 has 4 digits. The digits in 1152 are 1, 1, 5, and 2.
When you are asking for the sum of the digits of 1152, you are basically asking what is
1 plus 1 plus 5 plus 2?
Therefore, the sum of the digits in 1152 is as follows:
1 + 1 + 5 + 2 = 9
Sum of digits in 1153
See if you can calculate the sum of the digits in the next number on our list before you go here.
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