Solution - Long multiplication

Start by multiplying the ones digit (4) of the multiplier 4 by each digit of the multiplicand 204, from right to left.

Multiply the ones digit (4) of the multiplicator by the number in the ones place value:
4×4=16

Write 6 in the ones place.

Because the result is greater than 9, carry the 1 to the tens place.

Multiply the ones digit (4) of the multiplicator by the number in the tens place value and add the carried number (1):
4×0+1=1

Write 1 in the tens place.

Multiply the ones digit (4) of the multiplicator by the number in the hundreds place value:
4×2=8

Write 8 in the hundreds place.

The solution is: 816