Fill in the blank

First case:

23 × (–99) = ______× (–100 + _______)

= 23 × (-100 + 1)

Second case:

23 × (–99) =23 × _________+ 23 ×1

=23 × 100+ 23 ×1

(In first case we adjust to get the value of the question and in the second one distribution law is applied)

Thus the blank spaces are 1 and 100.