Let's divide 86429519 by 644
We want to figure out the number of times 86429519 can be divided by 644.

Moving on to step 1:
If we divide 8 by 644, we get 0 and a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 644

Moving on to step 2:
If we divide 86 by 644, we get 0 and a remainder of 86.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 86 after subtracting 0 from 86.
Fetch the next digit (4) from the dividend, attach it to 86 and continue: 864 / 644

Step 3:
If we divide 864 by 644, we get 1 and a remainder of 220.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 644 away from 864, we end up with 220.
Take the next digit (2) from the dividend and append it to 220, then repeat: 2202 / 644

Advancing to step 4:
644 can be fit into 2202 3 times, resulting in a remainder of 270.
Put 3 as the next digit of the answer. 
Result so far: 13.0
The remainder is 270 after subtracting 1932 from 2202.
Fetch the next digit (9) from the dividend, attach it to 270 and continue: 2709 / 644

Step 5:
644 goes into 2709 4 times with a remainder of 133.
Put 4 as the next digit of the answer. 
Result so far: 134.0
The remainder is 133 after subtracting 2576 from 2709.
Grab the next digit (5) from the dividend, add it to 133, then carry on: 1335 / 644

Going ahead to step 6:
644 can be fit into 1335 2 times, resulting in a remainder of 47.
The next digit of our result is 2. 
Result so far: 1342.0
Subtracting 1288 from 1335 leaves us with 47.
Fetch the next digit (1) from the dividend, attach it to 47 and continue: 471 / 644

Going ahead to step 7:
471 divided by 644 is 0 with a remainder of 471.
Put 0 as the next digit of the answer. 
Result so far: 13420.0
Subtracting 0 from 471 leaves us with 471.
Grab the next digit (9) from the dividend, add it to 471, then carry on: 4719 / 644

Step 8:
The number 644 fits into 4719 7 times, leaving a remainder of 211.
Record the quotient 7 as the next digit in the result. 
Result so far: 134207.0
Subtract 4508 from 4719 to get 211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

Moving on to step 9:
644 goes into 2110 3 times with a remainder of 178.
The number 3 becomes the next digit in our result. 
Result so far: 134207.3
Deduct 1932 from 2110 and we're left with 178.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1780, and continue the process.

Going ahead to step 10:
644 goes into 1780 2 times with a remainder of 492.
Write down 2 as next digit of the result. 
Result so far: 134207.32
The remainder is 492 after subtracting 1288 from 1780.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4920, and continue the process.

Let's proceed to step 11:
When dividing 4920 by 644, we get 7 with a remainder of 412.
The next digit of our result is 7. 
Result so far: 134207.327
Deduct 4508 from 4920 and we're left with 412.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4120, and continue the process.

Step 12:
If we divide 4120 by 644, we get 6 and a remainder of 256.
Use 6 as the next digit of our solution. 
Result so far: 134207.3276
Subtracting 3864 from 4120 leaves us with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Going ahead to step 13:
2560 divided by 644 is 3 with a remainder of 628.
Write down 3 as next digit of the result. 
Result so far: 134207.32763
If we subtract 1932 from 2560, we get 628.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6280, and continue the process.

Step 14:
If we divide 6280 by 644, we get 9 and a remainder of 484.
Write down 9 as next digit of the result. 
Result so far: 134207.327639
Subtract 5796 from 6280 to get 484.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4840, and continue the process.

Step 15:
If we divide 4840 by 644, we get 7 and a remainder of 332.
The next digit of our result is 7. 
Result so far: 134207.3276397
The remainder is 332 after subtracting 4508 from 4840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

Advancing to step 16:
When dividing 3320 by 644, we get 5 with a remainder of 100.
Use 5 as the next digit of our solution. 
Result so far: 134207.32763975
Deduct 3220 from 3320 and we're left with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

The final result is 134207.32763975 with a remainder of 1e-07.