2( 1) negative two thirds, three (2) two thirds and three (3) negative two thirds and three (4) negative two thirds.
3( 1) minus one third (2) three thirds and three (3) one (4) one.
4 ( 1) 1+2+3- 10 (2) 0+0+8 (3) 0.5- 1+0.25-0.5+0.75- 1 (4)
If you want a specific process, I'd better send you the photos on paper.