standard_description: Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
problem_activity: Stage 6: Shapes on the Coordinate Grid
Required Preparation
Materials to Copy
Blackline Masters
Which One Stage 6 Gameboard

Narrative
One partner chooses a rectangle on the coordinate plane from the board. The other partner asks questions to figure out which rectangle on the coordinate plane their partner chose.


aligns: no