79938539 ÷ 870 
Our goal is to divide 79938539 by 870.

On to step 1:
7 divided by 870 is 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Append the next digit (9) from the dividend to 7 and continue with: 79 / 870

Step 2:
79 divided by 870 is 0 with a remainder of 79.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 79 and we're left with 79.
Fetch the next digit (9) from the dividend, attach it to 79 and continue: 799 / 870

On to step 3:
870 can be fit into 799 0 times, resulting in a remainder of 799.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 799, we end up with 799.
Include the next digit (3) from the dividend after 799, then repeat: 7993 / 870

Moving on to step 4:
870 can be fit into 7993 9 times, resulting in a remainder of 163.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
If we take 7830 away from 7993, we end up with 163.
Append the next digit (8) from the dividend to 163 and continue with: 1638 / 870

On to step 5:
1638 divided by 870 is 1 with a remainder of 768.
The next digit of our result is 1. 
Result so far: 91.0
The remainder is 768 after subtracting 870 from 1638.
Take the next digit (5) from the dividend and append it to 768, then repeat: 7685 / 870

Let's proceed to step 6:
The number 870 fits into 7685 8 times, leaving a remainder of 725.
Record the quotient 8 as the next digit in the result. 
Result so far: 918.0
The remainder is 725 after subtracting 6960 from 7685.
Fetch the next digit (3) from the dividend, attach it to 725 and continue: 7253 / 870

Let's proceed to step 7:
7253 divided by 870 is 8 with a remainder of 293.
The next digit of our result is 8. 
Result so far: 9188.0
If we subtract 6960 from 7253, we get 293.
Take the next digit (9) from the dividend and append it to 293, then repeat: 2939 / 870

On to step 8:
When dividing 2939 by 870, we get 3 with a remainder of 329.
The number 3 becomes the next digit in our result. 
Result so far: 91883.0
Subtracting 2610 from 2939 leaves us with 329.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3290, and continue the process.

Moving on to step 9:
If we divide 3290 by 870, we get 3 and a remainder of 680.
The number 3 becomes the next digit in our result. 
Result so far: 91883.3
The remainder is 680 after subtracting 2610 from 3290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6800, and continue the process.

Moving on to step 10:
870 can be fit into 6800 7 times, resulting in a remainder of 710.
Put 7 as the next digit of the answer. 
Result so far: 91883.37
Deduct 6090 from 6800 and we're left with 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7100, and continue the process.

Advancing to step 11:
870 goes into 7100 8 times with a remainder of 140.
The next digit of our result is 8. 
Result so far: 91883.378
Subtract 6960 from 7100 to get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Going ahead to step 12:
If we divide 1400 by 870, we get 1 and a remainder of 530.
The next digit of our result is 1. 
Result so far: 91883.3781
If we take 870 away from 1400, we end up with 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5300, and continue the process.

Going ahead to step 13:
The number 870 fits into 5300 6 times, leaving a remainder of 80.
Record the quotient 6 as the next digit in the result. 
Result so far: 91883.37816
Subtracting 5220 from 5300 leaves us 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.

Advancing to step 14:
870 goes into 800 0 times with a remainder of 800.
Record the quotient 0 as the next digit in the result. 
Result so far: 91883.37816
Deduct 0 from 800 and we're left with 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8000, and continue the process.

Advancing to step 15:
8000 divided by 870 is 9 with a remainder of 170.
Put 9 as the next digit of the answer. 
Result so far: 91883.3781609
Subtracting 7830 from 8000 leaves us with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Let's proceed to step 16:
870 can be fit into 1700 1 times, resulting in a remainder of 830.
The next digit of our result is 1. 
Result so far: 91883.37816091
If we take 870 away from 1700, we end up with 830.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8300, and continue the process.

Our division results in 91883.37816091 with a remaining 8.3e-07.