37378130 divided by 221 
The aim is to understand the frequency of 221 in 37378130.

On to step 1:
221 can be fit into 3 0 times, resulting in a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Bring next digit (7) of the dividend behind the 3 and repeat the process: 37 / 221

Step 2:
If we divide 37 by 221, we get 0 and a remainder of 37.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 37 to get 37.
Fetch the next digit (3) from the dividend, attach it to 37 and continue: 373 / 221

Going ahead to step 3:
When dividing 373 by 221, we get 1 with a remainder of 152.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 221 from 373 to get 152.
Grab the next digit (7) from the dividend, add it to 152, then carry on: 1527 / 221

Let's proceed to step 4:
If we divide 1527 by 221, we get 6 and a remainder of 201.
Use 6 as the next digit of our solution. 
Result so far: 16.0
If we subtract 1326 from 1527, we get 201.
Fetch the next digit (8) from the dividend, attach it to 201 and continue: 2018 / 221

Moving on to step 5:
221 goes into 2018 9 times with a remainder of 29.
Record the quotient 9 as the next digit in the result. 
Result so far: 169.0
If we subtract 1989 from 2018, we get 29.
Fetch the next digit (1) from the dividend, attach it to 29 and continue: 291 / 221

Moving on to step 6:
291 divided by 221 is 1 with a remainder of 70.
Put 1 as the next digit of the answer. 
Result so far: 1691.0
Subtracting 221 from 291 leaves us with 70.
Grab the next digit (3) from the dividend, add it to 70, then carry on: 703 / 221

On to step 7:
The number 221 fits into 703 3 times, leaving a remainder of 40.
Use 3 as the next digit of our solution. 
Result so far: 16913.0
If we take 663 away from 703, we end up with 40.
Bring next digit (0) of the dividend behind the 40 and repeat the process: 400 / 221

Let's proceed to step 8:
221 goes into 400 1 times with a remainder of 179.
The next digit of our result is 1. 
Result so far: 169131.0
Deduct 221 from 400 and we're left with 179.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1790, and continue the process.

Going ahead to step 9:
If we divide 1790 by 221, we get 8 and a remainder of 22.
Record the quotient 8 as the next digit in the result. 
Result so far: 169131.8
If we subtract 1768 from 1790, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 10:
If we divide 220 by 221, we get 0 and a remainder of 220.
Use 0 as the next digit of our solution. 
Result so far: 169131.8
Subtract 0 from 220 to get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Going ahead to step 11:
If we divide 2200 by 221, we get 9 and a remainder of 211.
Use 9 as the next digit of our solution. 
Result so far: 169131.809
If we subtract 1989 from 2200, we get 211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

Advancing to step 12:
221 can be fit into 2110 9 times, resulting in a remainder of 121.
Record the quotient 9 as the next digit in the result. 
Result so far: 169131.8099
Subtracting 1989 from 2110 leaves us with 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

After the division, we end up with 169131.8099 and a remainder of 0.00121.