Fill in the blanks to make the statements true.

If the digit 1 is placed after a 2-digit number whose tens is t and ones digit is u, the new number is …………… .

The number initially was tu or 10t + u, but after adding 1 in its units place, tu gets shifted one unit higher.

This implies, t shifts to 100^th place, u shifts to 10^th place, 1 is allocated in units place.

The new number is tu1 or 100t + 10u + 1.