Predict the result
Multiply 230 by 1000.

Set up the model
Multiplying by one thousand changes the place value by three places.
Retain every original digit.

Work the example
Move each digit three places to the left.
The product is two hundred thirty thousand.

Check the result
Now multiply 5000 by 71000.
Take eight seconds to think before the answer appears.
[Eight-second silent pause to work; the answer remains hidden.]
The product is three hundred fifty five million.

Interpret the result
A place-value check prevents missing or adding a zero.