1. 890,000 and 89,000

See a pattern, simply move the decimal to the right 5 places for the first one or 4 places for the second one

2. 0.00004 and 0.000004

now we move the decimal place to the left 5 places for the first one and 6 places for the second one.

negative exponent move left

posite exponent move right

Bet you can get the next one.