87020337 ÷ 643 
We want to figure out the number of times 87020337 can be divided by 643.

Going ahead to step 1:
If we divide 8 by 643, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 643

Moving on to step 2:
When dividing 87 by 643, we get 0 with a remainder of 87.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 87, we get 87.
Include the next digit (0) from the dividend after 87, then repeat: 870 / 643

Going ahead to step 3:
870 divided by 643 is 1 with a remainder of 227.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 227 after subtracting 643 from 870.
Append the next digit (2) from the dividend to 227 and continue with: 2272 / 643

Advancing to step 4:
643 can be fit into 2272 3 times, resulting in a remainder of 343.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
Subtract 1929 from 2272 to get 343.
Append the next digit (0) from the dividend to 343 and continue with: 3430 / 643

On to step 5:
643 goes into 3430 5 times with a remainder of 215.
The next digit of our result is 5. 
Result so far: 135.0
Subtracting 3215 from 3430 leaves us with 215.
Fetch the next digit (3) from the dividend, attach it to 215 and continue: 2153 / 643

Step 6:
643 goes into 2153 3 times with a remainder of 224.
Write down 3 as next digit of the result. 
Result so far: 1353.0
Subtract 1929 from 2153 to get 224.
Bring next digit (3) of the dividend behind the 224 and repeat the process: 2243 / 643

On to step 7:
2243 divided by 643 is 3 with a remainder of 314.
Put 3 as the next digit of the answer. 
Result so far: 13533.0
Deduct 1929 from 2243 and we're left with 314.
Include the next digit (7) from the dividend after 314, then repeat: 3147 / 643

Step 8:
When dividing 3147 by 643, we get 4 with a remainder of 575.
Put 4 as the next digit of the answer. 
Result so far: 135334.0
If we take 2572 away from 3147, we end up with 575.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5750, and continue the process.

Advancing to step 9:
The number 643 fits into 5750 8 times, leaving a remainder of 606.
The next digit of our result is 8. 
Result so far: 135334.8
Subtracting 5144 from 5750 leaves us with 606.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6060, and continue the process.

Step 10:
643 goes into 6060 9 times with a remainder of 273.
Put 9 as the next digit of the answer. 
Result so far: 135334.89
Subtract 5787 from 6060 to get 273.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2730, and continue the process.

Moving on to step 11:
The number 643 fits into 2730 4 times, leaving a remainder of 158.
Use 4 as the next digit of our solution. 
Result so far: 135334.894
Deduct 2572 from 2730 and we're left with 158.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1580, and continue the process.

Step 12:
The number 643 fits into 1580 2 times, leaving a remainder of 294.
Record the quotient 2 as the next digit in the result. 
Result so far: 135334.8942
Deduct 1286 from 1580 and we're left with 294.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2940, and continue the process.

Moving on to step 13:
2940 divided by 643 is 4 with a remainder of 368.
Put 4 as the next digit of the answer. 
Result so far: 135334.89424
If we subtract 2572 from 2940, we get 368.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

On to step 14:
If we divide 3680 by 643, we get 5 and a remainder of 465.
Write down 5 as next digit of the result. 
Result so far: 135334.894245
Deduct 3215 from 3680 and we're left with 465.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4650, and continue the process.

Let's proceed to step 15:
When dividing 4650 by 643, we get 7 with a remainder of 149.
Use 7 as the next digit of our solution. 
Result so far: 135334.8942457
If we take 4501 away from 4650, we end up with 149.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1490, and continue the process.

On to step 16:
1490 divided by 643 is 2 with a remainder of 204.
The next digit of our result is 2. 
Result so far: 135334.89424572
Subtract 1286 from 1490 to get 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Our division results in 135334.89424572 with a remaining 2.04e-07.