Question

помогите!!!!!!!!
6538+65=
4468-18=
19640+54=
11996-764=
23880-11=
12+7456

Answer 1

6538+65=6603
4468-18=4450
19640+54=19694
11996-764=11232
23880-11=23869
7456+12=7468

Answer 2

6538+65=6 603
4468-18=4450
19640+54=19694
11996-764=11 232
23880-11=23 869
12+7456=7468