We look at the division of 64273151 by 420 
We're looking to find how many times 420 goes into 64273151.

On to step 1:
The number 420 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 420

On to step 2:
If we divide 64 by 420, we get 0 and a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 64 leaves us with 64.
Bring next digit (2) of the dividend behind the 64 and repeat the process: 642 / 420

Going ahead to step 3:
If we divide 642 by 420, we get 1 and a remainder of 222.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 420 from 642 to get 222.
Grab the next digit (7) from the dividend, add it to 222, then carry on: 2227 / 420

Moving on to step 4:
420 can be fit into 2227 5 times, resulting in a remainder of 127.
The next digit of our result is 5. 
Result so far: 15.0
Subtract 2100 from 2227 to get 127.
Bring next digit (3) of the dividend behind the 127 and repeat the process: 1273 / 420

On to step 5:
420 can be fit into 1273 3 times, resulting in a remainder of 13.
Put 3 as the next digit of the answer. 
Result so far: 153.0
Deduct 1260 from 1273 and we're left with 13.
Fetch the next digit (1) from the dividend, attach it to 13 and continue: 131 / 420

Going ahead to step 6:
If we divide 131 by 420, we get 0 and a remainder of 131.
Use 0 as the next digit of our solution. 
Result so far: 1530.0
Subtract 0 from 131 to get 131.
Include the next digit (5) from the dividend after 131, then repeat: 1315 / 420

Going ahead to step 7:
420 goes into 1315 3 times with a remainder of 55.
Write down 3 as next digit of the result. 
Result so far: 15303.0
Deduct 1260 from 1315 and we're left with 55.
Bring next digit (1) of the dividend behind the 55 and repeat the process: 551 / 420

Advancing to step 8:
When dividing 551 by 420, we get 1 with a remainder of 131.
The next digit of our result is 1. 
Result so far: 153031.0
The remainder is 131 after subtracting 420 from 551.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

Let's proceed to step 9:
If we divide 1310 by 420, we get 3 and a remainder of 50.
Write down 3 as next digit of the result. 
Result so far: 153031.3
Subtracting 1260 from 1310 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 10:
If we divide 500 by 420, we get 1 and a remainder of 80.
The number 1 becomes the next digit in our result. 
Result so far: 153031.31
The remainder is 80 after subtracting 420 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 11:
The number 420 fits into 800 1 times, leaving a remainder of 380.
Put 1 as the next digit of the answer. 
Result so far: 153031.311
The remainder is 380 after subtracting 420 from 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

The quotient of the division is 153031.311, and the remainder is 0.038.