87289651 ÷ 645 
Our goal is to divide 87289651 by 645.

Moving on to step 1:
645 can be fit into 8 0 times, resulting in a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 645

Advancing to step 2:
87 divided by 645 is 0 with a remainder of 87.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 87 after subtracting 0 from 87.
Grab the next digit (2) from the dividend, add it to 87, then carry on: 872 / 645

On to step 3:
645 goes into 872 1 times with a remainder of 227.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 645 from 872 and we're left with 227.
Fetch the next digit (8) from the dividend, attach it to 227 and continue: 2278 / 645

On to step 4:
645 goes into 2278 3 times with a remainder of 343.
Write down 3 as next digit of the result. 
Result so far: 13.0
If we subtract 1935 from 2278, we get 343.
Take the next digit (9) from the dividend and append it to 343, then repeat: 3439 / 645

Let's proceed to step 5:
645 can be fit into 3439 5 times, resulting in a remainder of 214.
The number 5 becomes the next digit in our result. 
Result so far: 135.0
Subtracting 3225 from 3439 leaves us with 214.
Append the next digit (6) from the dividend to 214 and continue with: 2146 / 645

Moving on to step 6:
If we divide 2146 by 645, we get 3 and a remainder of 211.
Use 3 as the next digit of our solution. 
Result so far: 1353.0
Subtract 1935 from 2146 to get 211.
Append the next digit (5) from the dividend to 211 and continue with: 2115 / 645

Advancing to step 7:
When dividing 2115 by 645, we get 3 with a remainder of 180.
Put 3 as the next digit of the answer. 
Result so far: 13533.0
The remainder is 180 after subtracting 1935 from 2115.
Fetch the next digit (1) from the dividend, attach it to 180 and continue: 1801 / 645

Step 8:
The number 645 fits into 1801 2 times, leaving a remainder of 511.
The number 2 becomes the next digit in our result. 
Result so far: 135332.0
Deduct 1290 from 1801 and we're left with 511.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5110, and continue the process.

On to step 9:
When dividing 5110 by 645, we get 7 with a remainder of 595.
Put 7 as the next digit of the answer. 
Result so far: 135332.7
Subtract 4515 from 5110 to get 595.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5950, and continue the process.

Let's proceed to step 10:
645 goes into 5950 9 times with a remainder of 145.
Put 9 as the next digit of the answer. 
Result so far: 135332.79
The remainder is 145 after subtracting 5805 from 5950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Let's proceed to step 11:
1450 divided by 645 is 2 with a remainder of 160.
Record the quotient 2 as the next digit in the result. 
Result so far: 135332.792
If we subtract 1290 from 1450, we get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Advancing to step 12:
645 can be fit into 1600 2 times, resulting in a remainder of 310.
Write down 2 as next digit of the result. 
Result so far: 135332.7922
The remainder is 310 after subtracting 1290 from 1600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Our division results in 135332.7922 with a remaining 0.0031.