Solution - Long multiplication

Start by multiplying the ones digit (5) of the multiplier 5 by each digit of the multiplicand 86,400, from right to left.

Multiply the ones digit (5) of the multiplicator by the number in the ones place value:
5×0=0

Write 0 in the ones place.

Multiply the ones digit (5) of the multiplicator by the number in the tens place value:
5×0=0

Write 0 in the tens place.

Multiply the ones digit (5) of the multiplicator by the number in the hundreds place value:
5×4=20

Write 0 in the hundreds place.

Because the result is greater than 9, carry the 2 to the thousands place.

Multiply the ones digit (5) of the multiplicator by the number in the thousands place value and add the carried number (2):
5×6+2=32

Write 2 in the thousands place.

Because the result is greater than 9, carry the 3 to the ten thousands place.

Multiply the ones digit (5) of the multiplicator by the number in the ten thousands place value and add the carried number (3):
5×8+3=43

Write 3 in the ten thousands place.

Because the result is greater than 9, carry the 4 to the hundred thousands place.

The solution is: 432,000