Place value is the value of the digit depending on its place in the number.

In the number 428721,

a) Place value of rightmost ‘2’ is tens place.

Hence, its place value = 2× 10

= 20

b) Place value of leftmost ‘2’ is ten thousand

Hence, its place value = 2× 10000

= 20000

∴ Product of place values = 20× 20000

= 400000