85866502 ÷ 438 
We want to figure out the number of times 85866502 can be divided by 438.

Step 1:
8 divided by 438 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Include the next digit (5) from the dividend after 8, then repeat: 85 / 438

Advancing to step 2:
The number 438 fits into 85 0 times, leaving a remainder of 85.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 85 leaves us with 85.
Grab the next digit (8) from the dividend, add it to 85, then carry on: 858 / 438

Step 3:
438 goes into 858 1 times with a remainder of 420.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 438 from 858, we get 420.
Bring next digit (6) of the dividend behind the 420 and repeat the process: 4206 / 438

On to step 4:
The number 438 fits into 4206 9 times, leaving a remainder of 264.
Put 9 as the next digit of the answer. 
Result so far: 19.0
If we subtract 3942 from 4206, we get 264.
Take the next digit (6) from the dividend and append it to 264, then repeat: 2646 / 438

Let's proceed to step 5:
438 can be fit into 2646 6 times, resulting in a remainder of 18.
Use 6 as the next digit of our solution. 
Result so far: 196.0
Subtract 2628 from 2646 to get 18.
Fetch the next digit (5) from the dividend, attach it to 18 and continue: 185 / 438

Let's proceed to step 6:
438 can be fit into 185 0 times, resulting in a remainder of 185.
Write down 0 as next digit of the result. 
Result so far: 1960.0
The remainder is 185 after subtracting 0 from 185.
Take the next digit (0) from the dividend and append it to 185, then repeat: 1850 / 438

Step 7:
When dividing 1850 by 438, we get 4 with a remainder of 98.
Put 4 as the next digit of the answer. 
Result so far: 19604.0
Subtracting 1752 from 1850 leaves us with 98.
Bring next digit (2) of the dividend behind the 98 and repeat the process: 982 / 438

Advancing to step 8:
When dividing 982 by 438, we get 2 with a remainder of 106.
Use 2 as the next digit of our solution. 
Result so far: 196042.0
Deduct 876 from 982 and we're left with 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

On to step 9:
1060 divided by 438 is 2 with a remainder of 184.
Use 2 as the next digit of our solution. 
Result so far: 196042.2
The remainder is 184 after subtracting 876 from 1060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

Advancing to step 10:
438 goes into 1840 4 times with a remainder of 88.
Write down 4 as next digit of the result. 
Result so far: 196042.24
The remainder is 88 after subtracting 1752 from 1840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Step 11:
438 goes into 880 2 times with a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 196042.242
If we subtract 876 from 880, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 12:
If we divide 40 by 438, we get 0 and a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 196042.242
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 13:
If we divide 400 by 438, we get 0 and a remainder of 400.
The next digit of our result is 0. 
Result so far: 196042.242
Subtract 0 from 400 to get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

After the division, we end up with 196042.242 and a remainder of 0.0004.