**Lesson Steps**:

1) I solve the multiplication 0.5 x 0.4 as in the picture, without taking into account the comma

2) I count the decimal digits in 0.5 and 0.4, which in this case are 2; for every decimal digit, divide the result of multiplication /10, that is 20/10/10 = 0.2

**Answer**:

0.2

**Grade**: 5

**Level**: Primary

**Subject**: Math

**Topic**: Exponents