Show a way to count from 668 to 900 using ones, tens, and hundreds

We can count from 668 to 900 using ones, tens, and hundreds.
if we add 2 ones to 668= 668 + 2 = the number will be 670
and then add 3 tens = 670 + 30 = 700, the number will be 700
now add 2 hundreds, 700 + 200 = 900
So the way is:
668 + 2 ones = 670
670 + 3 tens = 700
700 + 2 hundreds = 900
or
668 + 2 hundreds = 868
868 + 3 tens = 898
898 + 2 ones = 900

Idon’t know what the answer is i wish i could