como puedes saber con anticipacion el numero de cifras decimales que lleva el resultado de multiplicar un numero natural por un decimal

The same number as in the multiplier

Step-by-step explanation:

The number of decimal places in the product is the sum of the decimal places in the factors.

A natural number is an integer. It has no decimal places.

So, the product has the product has the same number of decimal places as the multiplier.

For example, 2 * 3.45 = 6.90

The number 3.45 has two decimal places, so the product has two decimal places.