Question

Find the products show your thinking of 100,000,000 × 90

Answer 1

we multiply the digits different from 0

`1*9=9`

and now add the total of zeros=9

`9.000.000.000`

a diferent exercise

`200*320`

you multiply 2x32 and add 3 zeros

the solution is

`2*32=64`

with the zeros

`64000`