Let's divide 61840066 by 421
The aim is to understand the frequency of 421 in 61840066.

Advancing to step 1:
The number 421 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Grab the next digit (1) from the dividend, add it to 6, then carry on: 61 / 421

Step 2:
61 divided by 421 is 0 with a remainder of 61.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 61, we get 61.
Include the next digit (8) from the dividend after 61, then repeat: 618 / 421

Advancing to step 3:
When dividing 618 by 421, we get 1 with a remainder of 197.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 421 away from 618, we end up with 197.
Append the next digit (4) from the dividend to 197 and continue with: 1974 / 421

Advancing to step 4:
1974 divided by 421 is 4 with a remainder of 290.
Write down 4 as next digit of the result. 
Result so far: 14.0
Deduct 1684 from 1974 and we're left with 290.
Grab the next digit (0) from the dividend, add it to 290, then carry on: 2900 / 421

Going ahead to step 5:
421 goes into 2900 6 times with a remainder of 374.
Record the quotient 6 as the next digit in the result. 
Result so far: 146.0
If we subtract 2526 from 2900, we get 374.
Bring next digit (0) of the dividend behind the 374 and repeat the process: 3740 / 421

Let's proceed to step 6:
When dividing 3740 by 421, we get 8 with a remainder of 372.
Put 8 as the next digit of the answer. 
Result so far: 1468.0
Deduct 3368 from 3740 and we're left with 372.
Bring next digit (6) of the dividend behind the 372 and repeat the process: 3726 / 421

On to step 7:
The number 421 fits into 3726 8 times, leaving a remainder of 358.
Use 8 as the next digit of our solution. 
Result so far: 14688.0
Subtract 3368 from 3726 to get 358.
Bring next digit (6) of the dividend behind the 358 and repeat the process: 3586 / 421

Advancing to step 8:
421 goes into 3586 8 times with a remainder of 218.
Put 8 as the next digit of the answer. 
Result so far: 146888.0
If we subtract 3368 from 3586, we get 218.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2180, and continue the process.

Going ahead to step 9:
421 can be fit into 2180 5 times, resulting in a remainder of 75.
Record the quotient 5 as the next digit in the result. 
Result so far: 146888.5
If we subtract 2105 from 2180, we get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Let's proceed to step 10:
When dividing 750 by 421, we get 1 with a remainder of 329.
Record the quotient 1 as the next digit in the result. 
Result so far: 146888.51
If we subtract 421 from 750, we get 329.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3290, and continue the process.

Step 11:
When dividing 3290 by 421, we get 7 with a remainder of 343.
Write down 7 as next digit of the result. 
Result so far: 146888.517
If we take 2947 away from 3290, we end up with 343.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3430, and continue the process.

Going ahead to step 12:
The number 421 fits into 3430 8 times, leaving a remainder of 62.
Use 8 as the next digit of our solution. 
Result so far: 146888.5178
If we take 3368 away from 3430, we end up with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

On to step 13:
If we divide 620 by 421, we get 1 and a remainder of 199.
Use 1 as the next digit of our solution. 
Result so far: 146888.51781
Subtracting 421 from 620 leaves us with 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

Going ahead to step 14:
421 goes into 1990 4 times with a remainder of 306.
Write down 4 as next digit of the result. 
Result so far: 146888.517814
If we take 1684 away from 1990, we end up with 306.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3060, and continue the process.

On to step 15:
If we divide 3060 by 421, we get 7 and a remainder of 113.
The next digit of our result is 7. 
Result so far: 146888.5178147
Subtract 2947 from 3060 to get 113.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1130, and continue the process.

Let's proceed to step 16:
421 can be fit into 1130 2 times, resulting in a remainder of 288.
Write down 2 as next digit of the result. 
Result so far: 146888.51781472
If we subtract 842 from 1130, we 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 146888.51781472 and a remainder of 2.88e-07.