Who is the fastest?

Addition:

Two students come to the front of the classroom. I roll the dice twice in the interactive whiteboard. The first one who says the correct result is the winner. We make two variants: one, watching the dice; another, without seeing it, just hearing the numbers.

Subtractions:

The procedure is the same, but this time, I say a number higher than six.  I roll  the dice and they  have to do subtraction.

This simple game motivates them much to do mental arithmetic.

By Maide - Primary 1 - Santísima Trinidad School