2 and 252 multiplied together equals 504. I wouldn't say that they "multiplied add up to", however, because it could be confusing whether you are talking about multiplication or addition.
33
-3 and 5
528
The numbers are: 80 and -20
12 and -4
21
13
2366
504 / 3 = 168 then add 1 on and take 1 off so 167 + 168 + 169 = 504
-30
-1