We're dividing 67375751 by 421 
The aim is to understand the frequency of 421 in 67375751.

Advancing to step 1:
6 divided by 421 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (7) of the dividend behind the 6 and repeat the process: 67 / 421

On to step 2:
If we divide 67 by 421, we get 0 and a remainder of 67.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 67 leaves us with 67.
Include the next digit (3) from the dividend after 67, then repeat: 673 / 421

Advancing to step 3:
If we divide 673 by 421, we get 1 and a remainder of 252.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 421 from 673 leaves us with 252.
Include the next digit (7) from the dividend after 252, then repeat: 2527 / 421

Going ahead to step 4:
When dividing 2527 by 421, we get 6 with a remainder of 1.
The next digit of our result is 6. 
Result so far: 16.0
Subtracting 2526 from 2527 leaves us with 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 421

On to step 5:
When dividing 15 by 421, we get 0 with a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 160.0
Subtracting 0 from 15 leaves us with 15.
Fetch the next digit (7) from the dividend, attach it to 15 and continue: 157 / 421

Moving on to step 6:
When dividing 157 by 421, we get 0 with a remainder of 157.
Put 0 as the next digit of the answer. 
Result so far: 1600.0
If we take 0 away from 157, we end up with 157.
Bring next digit (5) of the dividend behind the 157 and repeat the process: 1575 / 421

Step 7:
If we divide 1575 by 421, we get 3 and a remainder of 312.
The next digit of our result is 3. 
Result so far: 16003.0
If we subtract 1263 from 1575, we get 312.
Bring next digit (1) of the dividend behind the 312 and repeat the process: 3121 / 421

On to step 8:
The number 421 fits into 3121 7 times, leaving a remainder of 174.
The number 7 becomes the next digit in our result. 
Result so far: 160037.0
Subtract 2947 from 3121 to get 174.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1740, and continue the process.

Advancing to step 9:
421 goes into 1740 4 times with a remainder of 56.
Put 4 as the next digit of the answer. 
Result so far: 160037.4
If we subtract 1684 from 1740, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Moving on to step 10:
560 divided by 421 is 1 with a remainder of 139.
Put 1 as the next digit of the answer. 
Result so far: 160037.41
If we subtract 421 from 560, we get 139.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1390, and continue the process.

Step 11:
421 goes into 1390 3 times with a remainder of 127.
Write down 3 as next digit of the result. 
Result so far: 160037.413
The remainder is 127 after subtracting 1263 from 1390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1270, and continue the process.

Going ahead to step 12:
The number 421 fits into 1270 3 times, leaving a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 160037.4133
Subtracting 1263 from 1270 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

After the division, we end up with 160037.4133 and a remainder of 7e-05.