The factor pairs of 210 are (210,1)(105,2)(70,3)(42,5)(35,6)(30,7)(21,10)(15,14)
None of them add up to 23. If that was -210, you could use 30 and -7.
199
5 and -3
-29
3 and -5.
4 and 7
221
-209
The numbers are: 21 and -10
-22
The numbers are: -5 and 3
199
-5 and +3
That depends whether you want to add the numbers, to multiply them, or what.
5 and -3
-5 and 3
Multiply the number by 100 and add a percentage sign.
-1