Relating addition and subtraction and playing the game BUMP; counting down. Relating addition and subtraction and playing the game BUMP; Working with numbers, starting with a number and counting down ...

1 Doctoral Program in Mathematics Education, Khon Kaen University, Khon Kaen, Thailand. 2 Mathematics Education Program, Faculty of Education, Khon Kaen University, Khon Kaen, Thailand. The objective ...