(+4) + (+10) =
+14
(+3) - (+5) =
-2
(+7) + (-1) =
+6
(+10) - (+12) =
(-4) + (-4) =
-8
(-9) - (-6) =
+3
(+10) + (-20) =
-10
(+12) - (-6) =
+18
(-9) + (+10) + (-6) =
-5
(-7) - (+8) =
-15
Press F11 Select menu option View > Enter Fullscreen for full-screen mode