(-36)-(-21)-(-18)+16
=-36+21+18+16
=-15+21+18+16
=6+18+16
=40
(-8.5)-(-4.2)
=-8.5+4.2
=-4.3
(-1/2)-(+1/3)
=(-3/6)-2/6
=-5/6
1/4-1/2+1
=1/4-2/4+1
=-1/4+1
3/4
(-36)-(-21)-(-18)+16
=-36+21+18+16
=-15+21+18+16
=6+18+16
=40
(-8.5)-(-4.2)
=-8.5+4.2
=-4.3
(-1/2)-(+1/3)
=(-3/6)-2/6
=-5/6
1/4-1/2+1
=1/4-2/4+1
=-1/4+1
3/4