Let's divide 76305494 by 421
The aim is to understand the frequency of 421 in 76305494.

On to step 1:
If we divide 7 by 421, we get 0 and a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Append the next digit (6) from the dividend to 7 and continue with: 76 / 421

Step 2:
When dividing 76 by 421, we get 0 with a remainder of 76.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 76, we end up with 76.
Bring next digit (3) of the dividend behind the 76 and repeat the process: 763 / 421

Step 3:
If we divide 763 by 421, we get 1 and a remainder of 342.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 421 from 763 and we're left with 342.
Fetch the next digit (0) from the dividend, attach it to 342 and continue: 3420 / 421

Advancing to step 4:
3420 divided by 421 is 8 with a remainder of 52.
The number 8 becomes the next digit in our result. 
Result so far: 18.0
If we take 3368 away from 3420, we end up with 52.
Grab the next digit (5) from the dividend, add it to 52, then carry on: 525 / 421

Going ahead to step 5:
421 goes into 525 1 times with a remainder of 104.
Write down 1 as next digit of the result. 
Result so far: 181.0
If we subtract 421 from 525, we get 104.
Fetch the next digit (4) from the dividend, attach it to 104 and continue: 1044 / 421

Step 6:
421 can be fit into 1044 2 times, resulting in a remainder of 202.
Use 2 as the next digit of our solution. 
Result so far: 1812.0
Subtracting 842 from 1044 leaves us with 202.
Bring next digit (9) of the dividend behind the 202 and repeat the process: 2029 / 421

Let's proceed to step 7:
421 goes into 2029 4 times with a remainder of 345.
The number 4 becomes the next digit in our result. 
Result so far: 18124.0
If we take 1684 away from 2029, we end up with 345.
Fetch the next digit (4) from the dividend, attach it to 345 and continue: 3454 / 421

Step 8:
If we divide 3454 by 421, we get 8 and a remainder of 86.
The next digit of our result is 8. 
Result so far: 181248.0
If we take 3368 away from 3454, we end up with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

On to step 9:
860 divided by 421 is 2 with a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 181248.2
Deduct 842 from 860 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 10:
If we divide 180 by 421, we get 0 and a remainder of 180.
Record the quotient 0 as the next digit in the result. 
Result so far: 181248.2
Subtract 0 from 180 to get 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Advancing to step 11:
421 goes into 1800 4 times with a remainder of 116.
Record the quotient 4 as the next digit in the result. 
Result so far: 181248.204
The remainder is 116 after subtracting 1684 from 1800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Advancing to step 12:
421 goes into 1160 2 times with a remainder of 318.
Put 2 as the next digit of the answer. 
Result so far: 181248.2042
Subtract 842 from 1160 to get 318.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3180, and continue the process.

Going ahead to step 13:
If we divide 3180 by 421, we get 7 and a remainder of 233.
Record the quotient 7 as the next digit in the result. 
Result so far: 181248.20427
Subtracting 2947 from 3180 leaves us with 233.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2330, and continue the process.

Moving on to step 14:
2330 divided by 421 is 5 with a remainder of 225.
The next digit of our result is 5. 
Result so far: 181248.204275
Subtracting 2105 from 2330 leaves us with 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

Going ahead to step 15:
2250 divided by 421 is 5 with a remainder of 145.
Put 5 as the next digit of the answer. 
Result so far: 181248.2042755
If we subtract 2105 from 2250, we get 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

The final result is 181248.2042755 with a remainder of 1.45e-06.