We're dividing 12420249 by 276 
We want to divide 12420249 by 276.

On to step 1:
The number 276 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 276

Step 2:
276 can be fit into 12 0 times, resulting in a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Take the next digit (4) from the dividend and append it to 12, then repeat: 124 / 276

Let's proceed to step 3:
124 divided by 276 is 0 with a remainder of 124.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 124 after subtracting 0 from 124.
Append the next digit (2) from the dividend to 124 and continue with: 1242 / 276

On to step 4:
The number 276 fits into 1242 4 times, leaving a remainder of 138.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtracting 1104 from 1242 leaves us with 138.
Fetch the next digit (0) from the dividend, attach it to 138 and continue: 1380 / 276

On to step 5:
If we divide 1380 by 276, we get 5 and a remainder of 0.
The next digit of our result is 5. 
Result so far: 45.0
Subtract 1380 from 1380 to get 0.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 276

Advancing to step 6:
If we divide 2 by 276, we get 0 and a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 450.0
If we take 0 away from 2, we end up with 2.
Fetch the next digit (4) from the dividend, attach it to 2 and continue: 24 / 276

Going ahead to step 7:
24 divided by 276 is 0 with a remainder of 24.
Use 0 as the next digit of our solution. 
Result so far: 4500.0
The remainder is 24 after subtracting 0 from 24.
Fetch the next digit (9) from the dividend, attach it to 24 and continue: 249 / 276

Going ahead to step 8:
If we divide 249 by 276, we get 0 and a remainder of 249.
Record the quotient 0 as the next digit in the result. 
Result so far: 45000.0
Subtract 0 from 249 to get 249.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2490, and continue the process.

Advancing to step 9:
If we divide 2490 by 276, we get 9 and a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 45000.9
If we subtract 2484 from 2490, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 10:
When dividing 60 by 276, we get 0 with a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 45000.9
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 11:
276 can be fit into 600 2 times, resulting in a remainder of 48.
Write down 2 as next digit of the result. 
Result so far: 45000.902
The remainder is 48 after subtracting 552 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 12:
If we divide 480 by 276, we get 1 and a remainder of 204.
The next digit of our result is 1. 
Result so far: 45000.9021
Deduct 276 from 480 and we're left with 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Going ahead to step 13:
2040 divided by 276 is 7 with a remainder of 108.
Write down 7 as next digit of the result. 
Result so far: 45000.90217
Subtracting 1932 from 2040 leaves us with 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Let's proceed to step 14:
If we divide 1080 by 276, we get 3 and a remainder of 252.
Use 3 as the next digit of our solution. 
Result so far: 45000.902173
If we take 828 away from 1080, we end up with 252.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2520, and continue the process.

Advancing to step 15:
276 goes into 2520 9 times with a remainder of 36.
The next digit of our result is 9. 
Result so far: 45000.9021739
The remainder is 36 after subtracting 2484 from 2520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 16:
276 can be fit into 360 1 times, resulting in a remainder of 84.
Use 1 as the next digit of our solution. 
Result so far: 45000.90217391
The remainder is 84 after subtracting 276 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

The final outcome is 45000.90217391, with a leftover of 8.4e-08.