$12-4=8$12−4=8. Use this to find:
$22-4=\editable{}$22−4=
$32-4=\editable{}$32−4=
$42-4=\editable{}$42−4=
$72-4=\editable{}$72−4=
We know that $9-2=7$9−2=7.
Use this to find:
$113+14=127$113+14=127
Use this to find:
$116+20=136$116+20=136
Use this to find: