I made two worksheets to support work I'm doing in a P2 class on addition/subtraction within 20.

Worksheets on addition/subtraction within 30 - currently using in a P2 class.

This is a workbook I made up for a primary 2 class experiment to look at what happens when a water filled balloon is put into the freezer and when it is taken out again. There is space for them to record their results at specific intervals. I hope this is useful.