645989 ÷ 87 
We want to figure out the number of times 645989 can be divided by 87.

Advancing to step 1:
If we divide 6 by 87, we get 0 and a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 87

Going ahead to step 2:
If we divide 64 by 87, we get 0 and a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Take the next digit (5) from the dividend and append it to 64, then repeat: 645 / 87

Step 3:
If we divide 645 by 87, we get 7 and a remainder of 36.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Deduct 609 from 645 and we're left with 36.
Take the next digit (9) from the dividend and append it to 36, then repeat: 369 / 87

Advancing to step 4:
When dividing 369 by 87, we get 4 with a remainder of 21.
Use 4 as the next digit of our solution. 
Result so far: 74.0
If we subtract 348 from 369, we get 21.
Fetch the next digit (8) from the dividend, attach it to 21 and continue: 218 / 87

Moving on to step 5:
218 divided by 87 is 2 with a remainder of 44.
Use 2 as the next digit of our solution. 
Result so far: 742.0
If we subtract 174 from 218, we get 44.
Take the next digit (9) from the dividend and append it to 44, then repeat: 449 / 87

On to step 6:
If we divide 449 by 87, we get 5 and a remainder of 14.
Record the quotient 5 as the next digit in the result. 
Result so far: 7425.0
Deduct 435 from 449 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 7:
If we divide 140 by 87, we get 1 and a remainder of 53.
Write down 1 as next digit of the result. 
Result so far: 7425.1
The remainder is 53 after subtracting 87 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Advancing to step 8:
When dividing 530 by 87, we get 6 with a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 7425.16
Subtracting 522 from 530 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 9:
87 goes into 80 0 times with a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 7425.16
Deduct 0 from 80 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 10:
87 can be fit into 800 9 times, resulting in a remainder of 17.
Use 9 as the next digit of our solution. 
Result so far: 7425.1609
Subtracting 783 from 800 leaves us with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 11:
87 goes into 170 1 times with a remainder of 83.
Put 1 as the next digit of the answer. 
Result so far: 7425.16091
Subtract 87 from 170 to get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

On to step 12:
When dividing 830 by 87, we get 9 with a remainder of 47.
The next digit of our result is 9. 
Result so far: 7425.160919
Subtracting 783 from 830 leaves us with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Moving on to step 13:
87 goes into 470 5 times with a remainder of 35.
Write down 5 as next digit of the result. 
Result so far: 7425.1609195
The remainder is 35 after subtracting 435 from 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 14:
350 divided by 87 is 4 with a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 7425.16091954
If we subtract 348 from 350, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

In conclusion, the division gives 7425.16091954 with a balance of 2e-09.