Question

with all of solutions

Answer 1

1. -7-9+12-16+4

=   -16-16+16

=   -32+16

=  -16

2. 412-98-84-7+35

= 412-189+35

= 412-154

= 258

3. -21-9+63-11-42

=   -30+63-53

=  -83+63

=   -20

4. 24-8+3-4-42

= 27-54

=  -27

5.  4+18+20-8-12

=42-20

=22

6. 37-23-65+9-12

=46-100

= -54