75810716 divided by 421 
The aim is to understand the frequency of 421 in 75810716.

Step 1:
When dividing 7 by 421, we get 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Fetch the next digit (5) from the dividend, attach it to 7 and continue: 75 / 421

On to step 2:
421 goes into 75 0 times with a remainder of 75.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 75, we end up with 75.
Fetch the next digit (8) from the dividend, attach it to 75 and continue: 758 / 421

Going ahead to step 3:
758 divided by 421 is 1 with a remainder of 337.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 421 from 758 and we're left with 337.
Bring next digit (1) of the dividend behind the 337 and repeat the process: 3371 / 421

Going ahead to step 4:
3371 divided by 421 is 8 with a remainder of 3.
The next digit of our result is 8. 
Result so far: 18.0
Subtract 3368 from 3371 to get 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 421

Advancing to step 5:
If we divide 30 by 421, we get 0 and a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 180.0
Subtracting 0 from 30 leaves us with 30.
Bring next digit (7) of the dividend behind the 30 and repeat the process: 307 / 421

Step 6:
If we divide 307 by 421, we get 0 and a remainder of 307.
Write down 0 as next digit of the result. 
Result so far: 1800.0
Deduct 0 from 307 and we're left with 307.
Take the next digit (1) from the dividend and append it to 307, then repeat: 3071 / 421

Let's proceed to step 7:
3071 divided by 421 is 7 with a remainder of 124.
The number 7 becomes the next digit in our result. 
Result so far: 18007.0
Subtracting 2947 from 3071 leaves us with 124.
Grab the next digit (6) from the dividend, add it to 124, then carry on: 1246 / 421

On to step 8:
421 can be fit into 1246 2 times, resulting in a remainder of 404.
The number 2 becomes the next digit in our result. 
Result so far: 180072.0
If we subtract 842 from 1246, we get 404.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4040, and continue the process.

Moving on to step 9:
421 goes into 4040 9 times with a remainder of 251.
The number 9 becomes the next digit in our result. 
Result so far: 180072.9
Deduct 3789 from 4040 and we're left with 251.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2510, and continue the process.

Let's proceed to step 10:
2510 divided by 421 is 5 with a remainder of 405.
Write down 5 as next digit of the result. 
Result so far: 180072.95
Deduct 2105 from 2510 and we're left with 405.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

On to step 11:
If we divide 4050 by 421, we get 9 and a remainder of 261.
The next digit of our result is 9. 
Result so far: 180072.959
Subtracting 3789 from 4050 leaves us with 261.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2610, and continue the process.

Let's proceed to step 12:
The number 421 fits into 2610 6 times, leaving a remainder of 84.
The number 6 becomes the next digit in our result. 
Result so far: 180072.9596
Subtracting 2526 from 2610 leaves us with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

On to step 13:
421 can be fit into 840 1 times, resulting in a remainder of 419.
The number 1 becomes the next digit in our result. 
Result so far: 180072.95961
Subtract 421 from 840 to get 419.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4190, and continue the process.

Moving on to step 14:
4190 divided by 421 is 9 with a remainder of 401.
The next digit of our result is 9. 
Result so far: 180072.959619
If we subtract 3789 from 4190, we get 401.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4010, and continue the process.

Going ahead to step 15:
4010 divided by 421 is 9 with a remainder of 221.
Put 9 as the next digit of the answer. 
Result so far: 180072.9596199
Subtract 3789 from 4010 to get 221.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2210, and continue the process.

The quotient of the division is 180072.9596199, and the remainder is 2.21e-06.