We look at the division of 84212991 by 668 
The aim is to understand the frequency of 668 in 84212991.

Advancing to step 1:
668 goes into 8 0 times with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (4) from the dividend, attach it to 8 and continue: 84 / 668

Let's proceed to step 2:
668 can be fit into 84 0 times, resulting in a remainder of 84.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 84 and we're left with 84.
Bring next digit (2) of the dividend behind the 84 and repeat the process: 842 / 668

Advancing to step 3:
842 divided by 668 is 1 with a remainder of 174.
The next digit of our result is 1. 
Result so far: 1.0
If we take 668 away from 842, we end up with 174.
Include the next digit (1) from the dividend after 174, then repeat: 1741 / 668

Advancing to step 4:
668 goes into 1741 2 times with a remainder of 405.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Subtracting 1336 from 1741 leaves us with 405.
Include the next digit (2) from the dividend after 405, then repeat: 4052 / 668

Going ahead to step 5:
668 can be fit into 4052 6 times, resulting in a remainder of 44.
Record the quotient 6 as the next digit in the result. 
Result so far: 126.0
Deduct 4008 from 4052 and we're left with 44.
Take the next digit (9) from the dividend and append it to 44, then repeat: 449 / 668

Moving on to step 6:
The number 668 fits into 449 0 times, leaving a remainder of 449.
Use 0 as the next digit of our solution. 
Result so far: 1260.0
The remainder is 449 after subtracting 0 from 449.
Grab the next digit (9) from the dividend, add it to 449, then carry on: 4499 / 668

Step 7:
4499 divided by 668 is 6 with a remainder of 491.
Write down 6 as next digit of the result. 
Result so far: 12606.0
If we subtract 4008 from 4499, we get 491.
Include the next digit (1) from the dividend after 491, then repeat: 4911 / 668

Going ahead to step 8:
If we divide 4911 by 668, we get 7 and a remainder of 235.
Put 7 as the next digit of the answer. 
Result so far: 126067.0
Deduct 4676 from 4911 and we're left with 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Moving on to step 9:
When dividing 2350 by 668, we get 3 with a remainder of 346.
Put 3 as the next digit of the answer. 
Result so far: 126067.3
If we subtract 2004 from 2350, we get 346.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3460, and continue the process.

Advancing to step 10:
When dividing 3460 by 668, we get 5 with a remainder of 120.
The number 5 becomes the next digit in our result. 
Result so far: 126067.35
Deduct 3340 from 3460 and we're left 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.

Going ahead to step 11:
When dividing 1200 by 668, we get 1 with a remainder of 532.
Use 1 as the next digit of our solution. 
Result so far: 126067.351
Deduct 668 from 1200 and we're left with 532.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5320, and continue the process.

Advancing to step 12:
668 can be fit into 5320 7 times, resulting in a remainder of 644.
Record the quotient 7 as the next digit in the result. 
Result so far: 126067.3517
Subtract 4676 from 5320 to get 644.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6440, and continue the process.

Step 13:
If we divide 6440 by 668, we get 9 and a remainder of 428.
Record the quotient 9 as the next digit in the result. 
Result so far: 126067.35179
Subtracting 6012 from 6440 leaves us with 428.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4280, and continue the process.

Going ahead to step 14:
If we divide 4280 by 668, we get 6 and a remainder of 272.
The next digit of our result is 6. 
Result so far: 126067.351796
If we subtract 4008 from 4280, we get 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Advancing to step 15:
668 can be fit into 2720 4 times, resulting in a remainder of 48.
Write down 4 as next digit of the result. 
Result so far: 126067.3517964
Subtracting 2672 from 2720 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 16:
668 can be fit into 480 0 times, resulting in a remainder of 480.
The number 0 becomes the next digit in our result. 
Result so far: 126067.3517964
Deduct 0 from 480 and we're left with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

After the division, we end up with 126067.3517964 and a remainder of 4.8e-07.