90648170 ÷ 397 
We want to divide 90648170 by 397.

Step 1:
397 can be fit into 9 0 times, resulting in a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 397

Step 2:
90 divided by 397 is 0 with a remainder of 90.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 90 after subtracting 0 from 90.
Append the next digit (6) from the dividend to 90 and continue with: 906 / 397

On to step 3:
906 divided by 397 is 2 with a remainder of 112.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 794 from 906 and we're left with 112.
Append the next digit (4) from the dividend to 112 and continue with: 1124 / 397

On to step 4:
397 goes into 1124 2 times with a remainder of 330.
The next digit of our result is 2. 
Result so far: 22.0
The remainder is 330 after subtracting 794 from 1124.
Grab the next digit (8) from the dividend, add it to 330, then carry on: 3308 / 397

Advancing to step 5:
The number 397 fits into 3308 8 times, leaving a remainder of 132.
The number 8 becomes the next digit in our result. 
Result so far: 228.0
Subtract 3176 from 3308 to get 132.
Take the next digit (1) from the dividend and append it to 132, then repeat: 1321 / 397

Going ahead to step 6:
If we divide 1321 by 397, we get 3 and a remainder of 130.
Use 3 as the next digit of our solution. 
Result so far: 2283.0
If we take 1191 away from 1321, we end up with 130.
Include the next digit (7) from the dividend after 130, then repeat: 1307 / 397

Going ahead to step 7:
397 can be fit into 1307 3 times, resulting in a remainder of 116.
Put 3 as the next digit of the answer. 
Result so far: 22833.0
Subtracting 1191 from 1307 leaves us with 116.
Include the next digit (0) from the dividend after 116, then repeat: 1160 / 397

Going ahead to step 8:
The number 397 fits into 1160 2 times, leaving a remainder of 366.
Put 2 as the next digit of the answer. 
Result so far: 228332.0
Subtracting 794 from 1160 leaves us with 366.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3660, and continue the process.

Let's proceed to step 9:
The number 397 fits into 3660 9 times, leaving a remainder of 87.
The next digit of our result is 9. 
Result so far: 228332.9
If we take 3573 away from 3660, we end up with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Advancing to step 10:
The number 397 fits into 870 2 times, leaving a remainder of 76.
The next digit of our result is 2. 
Result so far: 228332.92
Subtracting 794 from 870 leaves us with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Moving on to step 11:
When dividing 760 by 397, we get 1 with a remainder of 363.
The next digit of our result is 1. 
Result so far: 228332.921
The remainder is 363 after subtracting 397 from 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3630, and continue the process.

Advancing to step 12:
If we divide 3630 by 397, we get 9 and a remainder of 57.
Use 9 as the next digit of our solution. 
Result so far: 228332.9219
If we subtract 3573 from 3630, we get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Moving on to step 13:
If we divide 570 by 397, we get 1 and a remainder of 173.
Put 1 as the next digit of the answer. 
Result so far: 228332.92191
Subtract 397 from 570 to get 173.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1730, and continue the process.

Step 14:
397 goes into 1730 4 times with a remainder of 142.
Use 4 as the next digit of our solution. 
Result so far: 228332.921914
Deduct 1588 from 1730 and we're left with 142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Moving on to step 15:
397 can be fit into 1420 3 times, resulting in a remainder of 229.
Write down 3 as next digit of the result. 
Result so far: 228332.9219143
Deduct 1191 from 1420 and we're left with 229.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2290, and continue the process.

Let's proceed to step 16:
When dividing 2290 by 397, we get 5 with a remainder of 305.
Put 5 as the next digit of the answer. 
Result so far: 228332.92191435
Subtract 1985 from 2290 to get 305.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

The final result is 228332.92191435 with a remainder of 3.05e-07.