We look at the division of 345379 by 86 
We want to figure out the number of times 345379 can be divided by 86.

On to step 1:
The number 86 fits into 3 0 times, leaving a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Include the next digit (4) from the dividend after 3, then repeat: 34 / 86

Advancing to step 2:
The number 86 fits into 34 0 times, leaving a remainder of 34.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 34, we end up with 34.
Fetch the next digit (5) from the dividend, attach it to 34 and continue: 345 / 86

Going ahead to step 3:
345 divided by 86 is 4 with a remainder of 1.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we take 344 away from 345, we end up with 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 86

Moving on to step 4:
If we divide 13 by 86, we get 0 and a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 40.0
Subtracting 0 from 13 leaves us with 13.
Grab the next digit (7) from the dividend, add it to 13, then carry on: 137 / 86

Going ahead to step 5:
86 goes into 137 1 times with a remainder of 51.
Put 1 as the next digit of the answer. 
Result so far: 401.0
If we take 86 away from 137, we end up with 51.
Fetch the next digit (9) from the dividend, attach it to 51 and continue: 519 / 86

Let's proceed to step 6:
When dividing 519 by 86, we get 6 with a remainder of 3.
The number 6 becomes the next digit in our result. 
Result so far: 4016.0
Subtract 516 from 519 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 7:
If we divide 30 by 86, we get 0 and a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 4016.0
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 8:
86 can be fit into 300 3 times, resulting in a remainder of 42.
The number 3 becomes the next digit in our result. 
Result so far: 4016.03
The remainder is 42 after subtracting 258 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 9:
86 goes into 420 4 times with a remainder of 76.
Record the quotient 4 as the next digit in the result. 
Result so far: 4016.034
The remainder is 76 after subtracting 344 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Advancing to step 10:
86 goes into 760 8 times with a remainder of 72.
The next digit of our result is 8. 
Result so far: 4016.0348
Deduct 688 from 760 and we're left with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Advancing to step 11:
86 goes into 720 8 times with a remainder of 32.
Record the quotient 8 as the next digit in the result. 
Result so far: 4016.03488
Subtracting 688 from 720 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

The quotient of the division is 4016.03488, and the remainder is 3.2e-05.