16
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83 + 17 = 100
1
If a number is added to itself, it is twice that number → 18 ÷ 2 = 9 → 9 + 9 = 18
6
To make a whole number, you need to add the amount that is missing from 3 to reach the nearest whole number. In this case, 3 is already a whole number, so no additional amount needs to be added to make it a whole. Therefore, nothing needs to be added to 3 to make it a whole number.