Answer: Hello mate!
We have the equation 7*5000 and we want to guess how many zeros this new equation will have.
You know that 7*5 = 35 has not zeros.
Then when you do the product there are no zeros added:
this means that the product still has the initial 3 zeros.
7*5000 = 35000
you can see that it only has 3 zeros:
if for example, we had 6*5000
we know that 6*5 = 30 then this multiple had one zero, and we can guess that the product of 6*5000 will have the 3 zeros in 5000 plus the zero of the product between 5 and 6: this is a total of 4 zeros:
lets check: 6*5000 = 30000
you can see that this product has 4 zeros :).
