Calculator: your hero or villain?

Now admit I'm normal
I'm really fast and current
On my cell phone I'm on the street
But at school I get out of place.

No one advises the old parents
Walking like our ancestors
See how useful that wagon
You can leave your car in the garden.

Math my owners loved
They easily reasoned
But came the multiplication table crisis
Some even reported watered down.

There are teachers who are afraid of me
But there are also others who are
The secrets are the planning
Action and reflection are food.

Without downplaying memorization
Eight times seven have what solution?
Twenty eight is four times seven
Soon it's double what you did

Diego Marcelino