We look at the division of 17802473 by 420 
The aim is to understand the frequency of 420 in 17802473.

Let's proceed to step 1:
1 divided by 420 is 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 420

Advancing to step 2:
420 can be fit into 17 0 times, resulting in a remainder of 17.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 17 and we're left with 17.
Fetch the next digit (8) from the dividend, attach it to 17 and continue: 178 / 420

Advancing to step 3:
If we divide 178 by 420, we get 0 and a remainder of 178.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 178, we get 178.
Bring next digit (0) of the dividend behind the 178 and repeat the process: 1780 / 420

On to step 4:
1780 divided by 420 is 4 with a remainder of 100.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtracting 1680 from 1780 leaves us with 100.
Fetch the next digit (2) from the dividend, attach it to 100 and continue: 1002 / 420

On to step 5:
When dividing 1002 by 420, we get 2 with a remainder of 162.
Record the quotient 2 as the next digit in the result. 
Result so far: 42.0
If we subtract 840 from 1002, we get 162.
Fetch the next digit (4) from the dividend, attach it to 162 and continue: 1624 / 420

Step 6:
420 can be fit into 1624 3 times, resulting in a remainder of 364.
Record the quotient 3 as the next digit in the result. 
Result so far: 423.0
If we take 1260 away from 1624, we end up with 364.
Append the next digit (7) from the dividend to 364 and continue with: 3647 / 420

Going ahead to step 7:
420 can be fit into 3647 8 times, resulting in a remainder of 287.
Put 8 as the next digit of the answer. 
Result so far: 4238.0
The remainder is 287 after subtracting 3360 from 3647.
Grab the next digit (3) from the dividend, add it to 287, then carry on: 2873 / 420

Going ahead to step 8:
When dividing 2873 by 420, we get 6 with a remainder of 353.
Write down 6 as next digit of the result. 
Result so far: 42386.0
Subtracting 2520 from 2873 leaves us with 353.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3530, and continue the process.

Step 9:
420 can be fit into 3530 8 times, resulting in a remainder of 170.
Put 8 as the next digit of the answer. 
Result so far: 42386.8
Subtract 3360 from 3530 to get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Going ahead to step 10:
420 goes into 1700 4 times with a remainder of 20.
Write down 4 as next digit of the result. 
Result so far: 42386.84
If we take 1680 away from 1700, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 11:
The number 420 fits into 200 0 times, leaving a remainder of 200.
Use 0 as the next digit of our solution. 
Result so far: 42386.84
If we subtract 0 from 200, we get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Moving on to step 12:
420 can be fit into 2000 4 times, resulting in a remainder of 320.
Record the quotient 4 as the next digit in the result. 
Result so far: 42386.8404
If we subtract 1680 from 2000, we get 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Step 13:
The number 420 fits into 3200 7 times, leaving a remainder of 260.
Use 7 as the next digit of our solution. 
Result so far: 42386.84047
If we subtract 2940 from 3200, we get 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Advancing to step 14:
2600 divided by 420 is 6 with a remainder of 80.
The next digit of our result is 6. 
Result so far: 42386.840476
Subtract 2520 from 2600 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 15:
If we divide 800 by 420, we get 1 and a remainder of 380.
Put 1 as the next digit of the answer. 
Result so far: 42386.8404761
If we take 420 away from 800, we end up with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Going ahead to step 16:
If we divide 3800 by 420, we get 9 and a remainder of 20.
The next digit of our result is 9. 
Result so far: 42386.84047619
Subtracting 3780 from 3800 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Our division results in 42386.84047619 with a remaining 2e-08.