Result Unknown
Ms. Dottore had 6 cookies. She baked 6 more. How many does she have altogether?
6+6=?
Change Unknown
Ms. Dottore had 6 cookies. She baked some more. She has 12 altogether. How many did she bake?
6+?=12
Start Unknown
Ms. Dottore had some cookies. She baked 6 more. She has 12 altogether. How many did she start with?
?+6=12