Here are small tongues of simple calculations which I give around January, by way of training at home for example.
It is about subtractions or about addenda, with for every tongue a small tactics of calculation to be worked (take 5 away, subtract 10, calculation on doubles, choose good operation).

• Calculations of evening (in January) - PDF (664)

For those who know that written duties are forbidden at home, it is possible to make it in quick calculation in class And for those who do not like notes, the reserved part is enough to cut up!