MCQ
If the digit $1$ is placed after a two digit number whose tens digit is $‘t’$ and units digit is $‘u’,$ the new number is:
- ANone
- B$10t + u + 1$
- C$t + u + 1$
- ✓$100t + 10u + 1$
✓
Answer
Correct option: D.
$100t + 10u + 1$
If any digit $q$ is appended to any number $x,$ it's value becomes $10x + q.$
So at first we have a number with tens' digit t and unit's digit $u.$
The number is $10t + u.$
After placing one more digit $1,$
it becomes $10(10t + u) + 1$
That is, $100t + 10u + 1.$
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