The "exponent" tells you how many times the same number, that is multiplied by itself, appears in the multiplication. In this case, just count how many times the number "1" appears.
How many times does 19 go into 1 ?
1
20 times
As many times as it happens.
Exactly 1 and a 1/2 times
1 goes into 52, 52 times.
Ten times 10/1=10
5 times with a remainder of 1/2
1 goes into 81 81 times.
1000 times
1 time