We look at the division of 10637150 by 420 
The aim is to understand the frequency of 420 in 10637150.

Advancing to step 1:
If we divide 1 by 420, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 420

Step 2:
When dividing 10 by 420, we get 0 with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 10 leaves us with 10.
Include the next digit (6) from the dividend after 10, then repeat: 106 / 420

Let's proceed to step 3:
420 goes into 106 0 times with a remainder of 106.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 106 leaves us with 106.
Append the next digit (3) from the dividend to 106 and continue with: 1063 / 420

Step 4:
420 can be fit into 1063 2 times, resulting in a remainder of 223.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 840 from 1063, we get 223.
Append the next digit (7) from the dividend to 223 and continue with: 2237 / 420

Advancing to step 5:
420 can be fit into 2237 5 times, resulting in a remainder of 137.
Write down 5 as next digit of the result. 
Result so far: 25.0
Subtract 2100 from 2237 to get 137.
Fetch the next digit (1) from the dividend, attach it to 137 and continue: 1371 / 420

Moving on to step 6:
420 can be fit into 1371 3 times, resulting in a remainder of 111.
Use 3 as the next digit of our solution. 
Result so far: 253.0
If we take 1260 away from 1371, we end up with 111.
Fetch the next digit (5) from the dividend, attach it to 111 and continue: 1115 / 420

On to step 7:
If we divide 1115 by 420, we get 2 and a remainder of 275.
Write down 2 as next digit of the result. 
Result so far: 2532.0
If we take 840 away from 1115, we end up with 275.
Bring next digit (0) of the dividend behind the 275 and repeat the process: 2750 / 420

Let's proceed to step 8:
When dividing 2750 by 420, we get 6 with a remainder of 230.
The next digit of our result is 6. 
Result so far: 25326.0
The remainder is 230 after subtracting 2520 from 2750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Moving on to step 9:
If we divide 2300 by 420, we get 5 and a remainder of 200.
Put 5 as the next digit of the answer. 
Result so far: 25326.5
The remainder is 200 after subtracting 2100 from 2300.
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 10:
420 goes into 2000 4 times with a remainder of 320.
Put 4 as the next digit of the answer. 
Result so far: 25326.54
The remainder is 320 after subtracting 1680 from 2000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Advancing to step 11:
When dividing 3200 by 420, we get 7 with a remainder of 260.
Record the quotient 7 as the next digit in the result. 
Result so far: 25326.547
Deduct 2940 from 3200 and we're left with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

On to step 12:
If we divide 2600 by 420, we get 6 and a remainder of 80.
The number 6 becomes the next digit in our result. 
Result so far: 25326.5476
If we subtract 2520 from 2600, we 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.

Step 13:
When dividing 800 by 420, we get 1 with a remainder of 380.
The next digit of our result is 1. 
Result so far: 25326.54761
Subtract 420 from 800 to get 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

On to step 14:
If we divide 3800 by 420, we get 9 and a remainder of 20.
The number 9 becomes the next digit in our result. 
Result so far: 25326.547619
The remainder is 20 after subtracting 3780 from 3800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 15:
The number 420 fits into 200 0 times, leaving a remainder of 200.
Put 0 as the next digit of the answer. 
Result so far: 25326.547619
Deduct 0 from 200 and we're left with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Advancing to step 16:
2000 divided by 420 is 4 with a remainder of 320.
The number 4 becomes the next digit in our result. 
Result so far: 25326.54761904
Subtract 1680 from 2000 to 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.

The final result is 25326.54761904 with a remainder of 3.2e-07.