Sally has a collection of 35 rugby cards. She loses 18 of these. How many does she have left? |
.gif){kind=small}
.gif){kind=small}
|
|
Student: Thirty five takeaway twenty is fifteen. Fifteen plus two makes seventeen. |
|
Students at the Advanced Additive stage are learning to choose appropriately from a repertoire of part-whole strategies. They see numbers as whole units in themselves but also understand that “nested” within these units is a range of possibilities for subdivision and recombining. |
|
