We look at the division of 78138921 by 846 
We're looking to find how many times 846 goes into 78138921.

On to step 1:
846 can be fit into 7 0 times, resulting in a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 846

Moving on to step 2:
The number 846 fits into 78 0 times, leaving a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 78 after subtracting 0 from 78.
Bring next digit (1) of the dividend behind the 78 and repeat the process: 781 / 846

Step 3:
781 divided by 846 is 0 with a remainder of 781.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 781 after subtracting 0 from 781.
Include the next digit (3) from the dividend after 781, then repeat: 7813 / 846

Let's proceed to step 4:
When dividing 7813 by 846, we get 9 with a remainder of 199.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
Subtract 7614 from 7813 to get 199.
Fetch the next digit (8) from the dividend, attach it to 199 and continue: 1998 / 846

Let's proceed to step 5:
If we divide 1998 by 846, we get 2 and a remainder of 306.
Put 2 as the next digit of the answer. 
Result so far: 92.0
The remainder is 306 after subtracting 1692 from 1998.
Fetch the next digit (9) from the dividend, attach it to 306 and continue: 3069 / 846

Advancing to step 6:
846 goes into 3069 3 times with a remainder of 531.
The number 3 becomes the next digit in our result. 
Result so far: 923.0
The remainder is 531 after subtracting 2538 from 3069.
Grab the next digit (2) from the dividend, add it to 531, then carry on: 5312 / 846

On to step 7:
If we divide 5312 by 846, we get 6 and a remainder of 236.
Put 6 as the next digit of the answer. 
Result so far: 9236.0
The remainder is 236 after subtracting 5076 from 5312.
Bring next digit (1) of the dividend behind the 236 and repeat the process: 2361 / 846

Advancing to step 8:
The number 846 fits into 2361 2 times, leaving a remainder of 669.
Use 2 as the next digit of our solution. 
Result so far: 92362.0
If we take 1692 away from 2361, we end up with 669.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6690, and continue the process.

On to step 9:
846 can be fit into 6690 7 times, resulting in a remainder of 768.
Put 7 as the next digit of the answer. 
Result so far: 92362.7
The remainder is 768 after subtracting 5922 from 6690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7680, and continue the process.

Going ahead to step 10:
846 goes into 7680 9 times with a remainder of 66.
The next digit of our result is 9. 
Result so far: 92362.79
Deduct 7614 from 7680 and we're left with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

On to step 11:
846 goes into 660 0 times with a remainder of 660.
The next digit of our result is 0. 
Result so far: 92362.79
Subtracting 0 from 660 leaves us with 660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6600, and continue the process.

Moving on to step 12:
6600 divided by 846 is 7 with a remainder of 678.
Record the quotient 7 as the next digit in the result. 
Result so far: 92362.7907
If we take 5922 away from 6600, we end up with 678.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6780, and continue the process.

Moving on to step 13:
846 goes into 6780 8 times with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 92362.79078
Subtract 6768 from 6780 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 14:
The number 846 fits into 120 0 times, leaving a remainder of 120.
Put 0 as the next digit of the answer. 
Result so far: 92362.79078
If we subtract 0 from 120, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

On to step 15:
846 goes into 1200 1 times with a remainder of 354.
The number 1 becomes the next digit in our result. 
Result so far: 92362.7907801
The remainder is 354 after subtracting 846 from 1200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

Step 16:
846 goes into 3540 4 times with a remainder of 156.
Put 4 as the next digit of the answer. 
Result so far: 92362.79078014
Subtracting 3384 from 3540 leaves us with 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

The quotient of the division is 92362.79078014, and the remainder is 1.56e-07.