We look at the division of 37315137 by 561 
The aim is to understand the frequency of 561 in 37315137.

Advancing to step 1:
3 divided by 561 is 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (7) from the dividend and append it to 3, then repeat: 37 / 561

Going ahead to step 2:
561 can be fit into 37 0 times, resulting in a remainder of 37.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 37 and we're left with 37.
Append the next digit (3) from the dividend to 37 and continue with: 373 / 561

Going ahead to step 3:
373 divided by 561 is 0 with a remainder of 373.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 373, we end up with 373.
Bring next digit (1) of the dividend behind the 373 and repeat the process: 3731 / 561

Going ahead to step 4:
561 goes into 3731 6 times with a remainder of 365.
The next digit of our result is 6. 
Result so far: 6.0
Subtract 3366 from 3731 to get 365.
Include the next digit (5) from the dividend after 365, then repeat: 3655 / 561

Let's proceed to step 5:
If we divide 3655 by 561, we get 6 and a remainder of 289.
Write down 6 as next digit of the result. 
Result so far: 66.0
Subtract 3366 from 3655 to get 289.
Fetch the next digit (1) from the dividend, attach it to 289 and continue: 2891 / 561

Going ahead to step 6:
561 can be fit into 2891 5 times, resulting in a remainder of 86.
The next digit of our result is 5. 
Result so far: 665.0
Deduct 2805 from 2891 and we're left with 86.
Fetch the next digit (3) from the dividend, attach it to 86 and continue: 863 / 561

Step 7:
If we divide 863 by 561, we get 1 and a remainder of 302.
Put 1 as the next digit of the answer. 
Result so far: 6651.0
Subtracting 561 from 863 leaves us with 302.
Include the next digit (7) from the dividend after 302, then repeat: 3027 / 561

Step 8:
The number 561 fits into 3027 5 times, leaving a remainder of 222.
Put 5 as the next digit of the answer. 
Result so far: 66515.0
If we subtract 2805 from 3027, we get 222.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2220, and continue the process.

Moving on to step 9:
2220 divided by 561 is 3 with a remainder of 537.
The next digit of our result is 3. 
Result so far: 66515.3
If we subtract 1683 from 2220, we get 537.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5370, and continue the process.

On to step 10:
5370 divided by 561 is 9 with a remainder of 321.
Use 9 as the next digit of our solution. 
Result so far: 66515.39
Subtract 5049 from 5370 to get 321.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3210, and continue the process.

Going ahead to step 11:
The number 561 fits into 3210 5 times, leaving a remainder of 405.
Record the quotient 5 as the next digit in the result. 
Result so far: 66515.395
If we subtract 2805 from 3210, we get 405.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

Step 12:
If we divide 4050 by 561, we get 7 and a remainder of 123.
The next digit of our result is 7. 
Result so far: 66515.3957
Subtract 3927 from 4050 to get 123.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1230, and continue the process.

Step 13:
The number 561 fits into 1230 2 times, leaving a remainder of 108.
Use 2 as the next digit of our solution. 
Result so far: 66515.39572
The remainder is 108 after subtracting 1122 from 1230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Advancing to step 14:
561 goes into 1080 1 times with a remainder of 519.
Write down 1 as next digit of the result. 
Result so far: 66515.395721
Subtracting 561 from 1080 leaves us with 519.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5190, and continue the process.

Moving on to step 15:
When dividing 5190 by 561, we get 9 with a remainder of 141.
Record the quotient 9 as the next digit in the result. 
Result so far: 66515.3957219
Subtracting 5049 from 5190 leaves us with 141.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1410, and continue the process.

Moving on to step 16:
If we divide 1410 by 561, we get 2 and a remainder of 288.
Write down 2 as next digit of the result. 
Result so far: 66515.39572192
Subtract 1122 from 1410 to get 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

After the division, we end up with 66515.39572192 and a remainder of 2.88e-07.