20+2= - 22, 20+20= - 40, 30+20= - 50, 100+100= - 200, 20-10= - 10, 4+4= - 8, 40+20= - 60, 60-30= - 30, 80+10= - 90, 100+200= - 300,

subtraction and addition

Leaderboard

Visual style

Options

Switch template

Continue editing: ?