uptetd16p1 q100
0. The digit at unit place of the number 399 - 350 is
- Option : D
- Explanation : (D) Unit digit of 399
Divide the index 99 by 4,
⇒
, we get remainder 3.
Thus, unit digit of 399 = Unit digit of 33 = 7
Unit digit of 350
Again, divide the index 50 by 4,
⇒
, we get remainder 2
Thus, unit digit of 350 = unit digit of 32 = 9
Now, by subtracting the unit digit's of 399 and 350, we get the answer.
= 7 - 9
= 8 [carry over of 7]
Thus, unit digit of the number 399 - 350 is 8.
