We're dividing 87421531 by 660 
We want to figure out the number of times 87421531 can be divided by 660.

On to step 1:
If we divide 8 by 660, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (7) from the dividend, attach it to 8 and continue: 87 / 660

Let's proceed to step 2:
If we divide 87 by 660, we get 0 and a remainder of 87.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 87, we end up with 87.
Grab the next digit (4) from the dividend, add it to 87, then carry on: 874 / 660

Let's proceed to step 3:
The number 660 fits into 874 1 times, leaving a remainder of 214.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 660 from 874, we get 214.
Grab the next digit (2) from the dividend, add it to 214, then carry on: 2142 / 660

Step 4:
The number 660 fits into 2142 3 times, leaving a remainder of 162.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
Deduct 1980 from 2142 and we're left with 162.
Take the next digit (1) from the dividend and append it to 162, then repeat: 1621 / 660

Advancing to step 5:
660 goes into 1621 2 times with a remainder of 301.
Write down 2 as next digit of the result. 
Result so far: 132.0
If we take 1320 away from 1621, we end up with 301.
Include the next digit (5) from the dividend after 301, then repeat: 3015 / 660

On to step 6:
660 goes into 3015 4 times with a remainder of 375.
Put 4 as the next digit of the answer. 
Result so far: 1324.0
If we subtract 2640 from 3015, we get 375.
Bring next digit (3) of the dividend behind the 375 and repeat the process: 3753 / 660

Step 7:
660 can be fit into 3753 5 times, resulting in a remainder of 453.
Put 5 as the next digit of the answer. 
Result so far: 13245.0
Subtracting 3300 from 3753 leaves us with 453.
Append the next digit (1) from the dividend to 453 and continue with: 4531 / 660

Let's proceed to step 8:
660 can be fit into 4531 6 times, resulting in a remainder of 571.
Use 6 as the next digit of our solution. 
Result so far: 132456.0
Subtracting 3960 from 4531 leaves us with 571.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5710, and continue the process.

Moving on to step 9:
If we divide 5710 by 660, we get 8 and a remainder of 430.
The next digit of our result is 8. 
Result so far: 132456.8
Deduct 5280 from 5710 and we're left with 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

Step 10:
If we divide 4300 by 660, we get 6 and a remainder of 340.
The next digit of our result is 6. 
Result so far: 132456.86
The remainder is 340 after subtracting 3960 from 4300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Let's proceed to step 11:
3400 divided by 660 is 5 with a remainder of 100.
Put 5 as the next digit of the answer. 
Result so far: 132456.865
The remainder is 100 after subtracting 3300 from 3400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Let's proceed to step 12:
660 goes into 1000 1 times with a remainder of 340.
Use 1 as the next digit of our solution. 
Result so far: 132456.8651
Subtract 660 from 1000 to get 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

On to step 13:
When dividing 3400 by 660, we get 5 with a remainder of 100.
Record the quotient 5 as the next digit in the result. 
Result so far: 132456.86515
Subtract 3300 from 3400 to get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Let's proceed to step 14:
660 can be fit into 1000 1 times, resulting in a remainder of 340.
Record the quotient 1 as the next digit in the result. 
Result so far: 132456.865151
The remainder is 340 after subtracting 660 from 1000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Let's proceed to step 15:
3400 divided by 660 is 5 with a remainder of 100.
Write down 5 as next digit of the result. 
Result so far: 132456.8651515
If we subtract 3300 from 3400, we get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Advancing to step 16:
1000 divided by 660 is 1 with a remainder of 340.
Use 1 as the next digit of our solution. 
Result so far: 132456.86515151
If we take 660 away from 1000, we end up with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Our division results in 132456.86515151 with a remaining 3.4e-07.