We divide 51860028 by 420
Our goal is to divide 51860028 by 420.

Moving on to step 1:
If we divide 5 by 420, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 420

Step 2:
51 divided by 420 is 0 with a remainder of 51.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 51 and we're left with 51.
Take the next digit (8) from the dividend and append it to 51, then repeat: 518 / 420

Moving on to step 3:
518 divided by 420 is 1 with a remainder of 98.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 420 from 518 leaves us with 98.
Append the next digit (6) from the dividend to 98 and continue with: 986 / 420

Going ahead to step 4:
If we divide 986 by 420, we get 2 and a remainder of 146.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Deduct 840 from 986 and we're left with 146.
Grab the next digit (0) from the dividend, add it to 146, then carry on: 1460 / 420

Advancing to step 5:
The number 420 fits into 1460 3 times, leaving a remainder of 200.
Write down 3 as next digit of the result. 
Result so far: 123.0
Subtract 1260 from 1460 to get 200.
Bring next digit (0) of the dividend behind the 200 and repeat the process: 2000 / 420

Step 6:
420 goes into 2000 4 times with a remainder of 320.
Put 4 as the next digit of the answer. 
Result so far: 1234.0
Deduct 1680 from 2000 and we're left with 320.
Fetch the next digit (2) from the dividend, attach it to 320 and continue: 3202 / 420

Advancing to step 7:
420 goes into 3202 7 times with a remainder of 262.
Put 7 as the next digit of the answer. 
Result so far: 12347.0
Subtract 2940 from 3202 to get 262.
Append the next digit (8) from the dividend to 262 and continue with: 2628 / 420

Moving on to step 8:
If we divide 2628 by 420, we get 6 and a remainder of 108.
Write down 6 as next digit of the result. 
Result so far: 123476.0
The remainder is 108 after subtracting 2520 from 2628.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Step 9:
1080 divided by 420 is 2 with a remainder of 240.
Record the quotient 2 as the next digit in the result. 
Result so far: 123476.2
The remainder is 240 after subtracting 840 from 1080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Going ahead to step 10:
If we divide 2400 by 420, we get 5 and a remainder of 300.
Write down 5 as next digit of the result. 
Result so far: 123476.25
Subtract 2100 from 2400 to get 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Moving on to step 11:
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: 123476.257
If we subtract 2940 from 3000, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 12:
420 goes into 600 1 times with a remainder of 180.
Record the quotient 1 as the next digit in the result. 
Result so far: 123476.2571
Subtracting 420 from 600 leaves us with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

On to step 13:
The number 420 fits into 1800 4 times, leaving a remainder of 120.
The next digit of our result is 4. 
Result so far: 123476.25714
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.

Going ahead to step 14:
If we divide 1200 by 420, we get 2 and a remainder of 360.
Put 2 as the next digit of the answer. 
Result so far: 123476.257142
Subtract 840 from 1200 to 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.

Let's proceed to step 15:
When dividing 3600 by 420, we get 8 with a remainder of 240.
Write down 8 as next digit of the result. 
Result so far: 123476.2571428
If we subtract 3360 from 3600, we get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Going ahead to step 16:
The number 420 fits into 2400 5 times, leaving a remainder of 300.
The number 5 becomes the next digit in our result. 
Result so far: 123476.25714285
If we take 2100 away from 2400, we end up with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

The final outcome is 123476.25714285, with a leftover of 3e-07.