We look at the division of 39919129 by 620 
The aim is to understand the frequency of 620 in 39919129.

On to step 1:
If we divide 3 by 620, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 620

Step 2:
620 can be fit into 39 0 times, resulting in a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Append the next digit (9) from the dividend to 39 and continue with: 399 / 620

Let's proceed to step 3:
When dividing 399 by 620, we get 0 with a remainder of 399.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 399 leaves us with 399.
Take the next digit (1) from the dividend and append it to 399, then repeat: 3991 / 620

Step 4:
3991 divided by 620 is 6 with a remainder of 271.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we take 3720 away from 3991, we end up with 271.
Fetch the next digit (9) from the dividend, attach it to 271 and continue: 2719 / 620

Going ahead to step 5:
620 goes into 2719 4 times with a remainder of 239.
Put 4 as the next digit of the answer. 
Result so far: 64.0
The remainder is 239 after subtracting 2480 from 2719.
Grab the next digit (1) from the dividend, add it to 239, then carry on: 2391 / 620

Moving on to step 6:
The number 620 fits into 2391 3 times, leaving a remainder of 531.
Record the quotient 3 as the next digit in the result. 
Result so far: 643.0
Subtract 1860 from 2391 to get 531.
Grab the next digit (2) from the dividend, add it to 531, then carry on: 5312 / 620

Let's proceed to step 7:
620 goes into 5312 8 times with a remainder of 352.
The next digit of our result is 8. 
Result so far: 6438.0
If we take 4960 away from 5312, we end up with 352.
Grab the next digit (9) from the dividend, add it to 352, then carry on: 3529 / 620

Let's proceed to step 8:
3529 divided by 620 is 5 with a remainder of 429.
Record the quotient 5 as the next digit in the result. 
Result so far: 64385.0
If we take 3100 away from 3529, we end up with 429.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4290, and continue the process.

Advancing to step 9:
When dividing 4290 by 620, we get 6 with a remainder of 570.
Write down 6 as next digit of the result. 
Result so far: 64385.6
Deduct 3720 from 4290 and we're left with 570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5700, and continue the process.

Advancing to step 10:
620 goes into 5700 9 times with a remainder of 120.
Write down 9 as next digit of the result. 
Result so far: 64385.69
If we take 5580 away from 5700, we end up with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Let's proceed to step 11:
The number 620 fits into 1200 1 times, leaving a remainder of 580.
Record the quotient 1 as the next digit in the result. 
Result so far: 64385.691
Deduct 620 from 1200 and we're left with 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Moving on to step 12:
620 can be fit into 5800 9 times, resulting in a remainder of 220.
The number 9 becomes the next digit in our result. 
Result so far: 64385.6919
Deduct 5580 from 5800 and we're left with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Let's proceed to step 13:
620 goes into 2200 3 times with a remainder of 340.
Put 3 as the next digit of the answer. 
Result so far: 64385.69193
If we take 1860 away from 2200, we end up with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Going ahead to step 14:
The number 620 fits into 3400 5 times, leaving a remainder of 300.
Record the quotient 5 as the next digit in the result. 
Result so far: 64385.691935
Subtracting 3100 from 3400 leaves us with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Going ahead to step 15:
620 goes into 3000 4 times with a remainder of 520.
The number 4 becomes the next digit in our result. 
Result so far: 64385.6919354
Deduct 2480 from 3000 and we're left with 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

On to step 16:
The number 620 fits into 5200 8 times, leaving a remainder of 240.
Use 8 as the next digit of our solution. 
Result so far: 64385.69193548
If we subtract 4960 from 5200, we get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

The quotient of the division is 64385.69193548, and the remainder is 2.4e-07.