Solution - Long multiplication

Start by multiplying the ones digit (2) of the multiplier 2 by each digit of the multiplicand 4,200, from right to left.

Multiply the ones digit (2) of the multiplicator by the number in the ones place value:
2×0=0

Write 0 in the ones place.

Multiply the ones digit (2) of the multiplicator by the number in the tens place value:
2×0=0

Write 0 in the tens place.

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

Write 4 in the hundreds place.

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

Write 8 in the thousands place.

The solution is: 8,400