In a two digit no if the 10th place has same value and the addition of values in unit place is 10 then the multiplication will be like:
Multiply the unit values .
Multiply the 10th value (which is same in both the digit) with 1 incremented value.
In a two digit no if the unit place has same value and the addition of values in 10th place is 10 then the multiplication will be like:
Multiply the unit place values with each other(which are same).
Multiply the 10th values with each other then add them with the unit place value.
If the difference between the two digit is 10. And the unit place contains value 5 then in that particular case the multiplication will be:
Unit place's value is 75(always remain the same because the unit place contains value 5)
Multiply the smaller one 10th place digit with larger digit incremented by 1.