We look at the division of 38969971 by 387 
The aim is to understand the frequency of 387 in 38969971.

Let's proceed to step 1:
387 can be fit into 3 0 times, resulting in 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.
Fetch the next digit (8) from the dividend, attach it to 3 and continue: 38 / 387

Advancing to step 2:
387 goes into 38 0 times with a remainder of 38.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 38, we get 38.
Grab the next digit (9) from the dividend, add it to 38, then carry on: 389 / 387

Step 3:
387 goes into 389 1 times with a remainder of 2.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 387 from 389 to get 2.
Grab the next digit (6) from the dividend, add it to 2, then carry on: 26 / 387

Going ahead to step 4:
If we divide 26 by 387, we get 0 and a remainder of 26.
The next digit of our result is 0. 
Result so far: 10.0
If we subtract 0 from 26, we get 26.
Append the next digit (9) from the dividend to 26 and continue with: 269 / 387

Going ahead to step 5:
When dividing 269 by 387, we get 0 with a remainder of 269.
The next digit of our result is 0. 
Result so far: 100.0
The remainder is 269 after subtracting 0 from 269.
Include the next digit (9) from the dividend after 269, then repeat: 2699 / 387

Let's proceed to step 6:
If we divide 2699 by 387, we get 6 and a remainder of 377.
Put 6 as the next digit of the answer. 
Result so far: 1006.0
If we take 2322 away from 2699, we end up with 377.
Append the next digit (7) from the dividend to 377 and continue with: 3777 / 387

Advancing to step 7:
The number 387 fits into 3777 9 times, leaving a remainder of 294.
Record the quotient 9 as the next digit in the result. 
Result so far: 10069.0
Subtracting 3483 from 3777 leaves us with 294.
Fetch the next digit (1) from the dividend, attach it to 294 and continue: 2941 / 387

Moving on to step 8:
When dividing 2941 by 387, we get 7 with a remainder of 232.
Record the quotient 7 as the next digit in the result. 
Result so far: 100697.0
Deduct 2709 from 2941 and we're left with 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

Moving on to step 9:
When dividing 2320 by 387, we get 5 with a remainder of 385.
Write down 5 as next digit of the result. 
Result so far: 100697.5
Subtract 1935 from 2320 to get 385.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3850, and continue the process.

Step 10:
387 goes into 3850 9 times with a remainder of 367.
Record the quotient 9 as the next digit in the result. 
Result so far: 100697.59
Deduct 3483 from 3850 and we're left with 367.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3670, and continue the process.

Step 11:
3670 divided by 387 is 9 with a remainder of 187.
Put 9 as the next digit of the answer. 
Result so far: 100697.599
Subtracting 3483 from 3670 leaves us with 187.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1870, and continue the process.

In conclusion, the division gives 100697.599 with a balance of 0.0187.