60906558 ÷ 420 
The aim is to understand the frequency of 420 in 60906558.

On to step 1:
When dividing 6 by 420, we get 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (0) of the dividend behind the 6 and repeat the process: 60 / 420

On to step 2:
The number 420 fits into 60 0 times, leaving a remainder of 60.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 60 and we're left with 60.
Append the next digit (9) from the dividend to 60 and continue with: 609 / 420

Advancing to step 3:
420 can be fit into 609 1 times, resulting in a remainder of 189.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 420 from 609 leaves us with 189.
Include the next digit (0) from the dividend after 189, then repeat: 1890 / 420

Going ahead to step 4:
420 goes into 1890 4 times with a remainder of 210.
Use 4 as the next digit of our solution. 
Result so far: 14.0
The remainder is 210 after subtracting 1680 from 1890.
Grab the next digit (6) from the dividend, add it to 210, then carry on: 2106 / 420

Moving on to step 5:
When dividing 2106 by 420, we get 5 with a remainder of 6.
Record the quotient 5 as the next digit in the result. 
Result so far: 145.0
The remainder is 6 after subtracting 2100 from 2106.
Fetch the next digit (5) from the dividend, attach it to 6 and continue: 65 / 420

Going ahead to step 6:
420 can be fit into 65 0 times, resulting in a remainder of 65.
Put 0 as the next digit of the answer. 
Result so far: 1450.0
If we subtract 0 from 65, we get 65.
Grab the next digit (5) from the dividend, add it to 65, then carry on: 655 / 420

Advancing to step 7:
420 can be fit into 655 1 times, resulting in a remainder of 235.
The number 1 becomes the next digit in our result. 
Result so far: 14501.0
The remainder is 235 after subtracting 420 from 655.
Fetch the next digit (8) from the dividend, attach it to 235 and continue: 2358 / 420

On to step 8:
The number 420 fits into 2358 5 times, leaving a remainder of 258.
The next digit of our result is 5. 
Result so far: 145015.0
The remainder is 258 after subtracting 2100 from 2358.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

Going ahead to step 9:
420 can be fit into 2580 6 times, resulting in a remainder of 60.
Put 6 as the next digit of the answer. 
Result so far: 145015.6
If we take 2520 away from 2580, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 10:
420 goes into 600 1 times with a remainder of 180.
The number 1 becomes the next digit in our result. 
Result so far: 145015.61
The remainder is 180 after subtracting 420 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Going ahead to step 11:
1800 divided by 420 is 4 with a remainder of 120.
Write down 4 as next digit of the result. 
Result so far: 145015.614
If we subtract 1680 from 1800, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 12:
420 can be fit into 1200 2 times, resulting in a remainder of 360.
Put 2 as the next digit of the answer. 
Result so far: 145015.6142
If we subtract 840 from 1200, we get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Advancing to step 13:
The number 420 fits into 3600 8 times, leaving a remainder of 240.
Record the quotient 8 as the next digit in the result. 
Result so far: 145015.61428
Deduct 3360 from 3600 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Advancing to step 14:
2400 divided by 420 is 5 with a remainder of 300.
Use 5 as the next digit of our solution. 
Result so far: 145015.614285
The remainder is 300 after subtracting 2100 from 2400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Step 15:
3000 divided by 420 is 7 with a remainder of 60.
Record the quotient 7 as the next digit in the result. 
Result so far: 145015.6142857
The remainder is 60 after subtracting 2940 from 3000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 16:
420 goes into 600 1 times with a remainder of 180.
Use 1 as the next digit of our solution. 
Result so far: 145015.61428571
If we subtract 420 from 600, we 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.

In conclusion, the division gives 145015.61428571 with a balance of 1.8e-07.