*NEW* AS 15 16 17 TAKE A GROUP AWAY, FIND DIFFERENCE, JOIN GROUPS TOGETHER
ADDITION & SUBTRACTION 15 TAKE A GROUP AWAY
ADDITION & SUBTRACTION 16 FIND DIFFERENCE BY ADDING ON AND TAKING AWAY
ADDITION & SUBTRACTION 17 JOIN GROUPS TOGETHER TO ADD
The ELEMENTS in this group are investigated informally initially after demonstrating understanding of groups flexibly, and are intrinsically related as students compare groups, add to groups and take away from groups.