We're dividing 75370986 by 625 
The aim is to understand the frequency of 625 in 75370986.

Step 1:
If we divide 7 by 625, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Grab the next digit (5) from the dividend, add it to 7, then carry on: 75 / 625

Advancing to step 2:
625 goes into 75 0 times with a remainder of 75.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 75, we get 75.
Grab the next digit (3) from the dividend, add it to 75, then carry on: 753 / 625

Moving on to step 3:
When dividing 753 by 625, we get 1 with a remainder of 128.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 625 from 753, we get 128.
Fetch the next digit (7) from the dividend, attach it to 128 and continue: 1287 / 625

Going ahead to step 4:
When dividing 1287 by 625, we get 2 with a remainder of 37.
The next digit of our result is 2. 
Result so far: 12.0
Subtract 1250 from 1287 to get 37.
Bring next digit (0) of the dividend behind the 37 and repeat the process: 370 / 625

On to step 5:
625 can be fit into 370 0 times, resulting in a remainder of 370.
The number 0 becomes the next digit in our result. 
Result so far: 120.0
The remainder is 370 after subtracting 0 from 370.
Take the next digit (9) from the dividend and append it to 370, then repeat: 3709 / 625

On to step 6:
625 goes into 3709 5 times with a remainder of 584.
Use 5 as the next digit of our solution. 
Result so far: 1205.0
If we subtract 3125 from 3709, we get 584.
Bring next digit (8) of the dividend behind the 584 and repeat the process: 5848 / 625

Step 7:
If we divide 5848 by 625, we get 9 and a remainder of 223.
Record the quotient 9 as the next digit in the result. 
Result so far: 12059.0
Deduct 5625 from 5848 and we're left with 223.
Bring next digit (6) of the dividend behind the 223 and repeat the process: 2236 / 625

Step 8:
2236 divided by 625 is 3 with a remainder of 361.
Write down 3 as next digit of the result. 
Result so far: 120593.0
If we take 1875 away from 2236, we end up with 361.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3610, and continue the process.

On to step 9:
3610 divided by 625 is 5 with a remainder of 485.
Write down 5 as next digit of the result. 
Result so far: 120593.5
Subtract 3125 from 3610 to get 485.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4850, and continue the process.

On to step 10:
625 can be fit into 4850 7 times, resulting in a remainder of 475.
Put 7 as the next digit of the answer. 
Result so far: 120593.57
Deduct 4375 from 4850 and we're left with 475.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4750, and continue the process.

Going ahead to step 11:
4750 divided by 625 is 7 with a remainder of 375.
The number 7 becomes the next digit in our result. 
Result so far: 120593.577
Deduct 4375 from 4750 and we're left with 375.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3750, and continue the process.

The final outcome is 120593.577, with a leftover of 0.0375.