13966040 divided by 428 
We want to figure out the number of times 13966040 can be divided by 428.

Step 1:
The number 428 fits into 1 0 times, leaving a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 428

Let's proceed to step 2:
When dividing 13 by 428, we get 0 with a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 13 to get 13.
Include the next digit (9) from the dividend after 13, then repeat: 139 / 428

Moving on to step 3:
If we divide 139 by 428, we get 0 and a remainder of 139.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 139 to get 139.
Append the next digit (6) from the dividend to 139 and continue with: 1396 / 428

Going ahead to step 4:
If we divide 1396 by 428, we get 3 and a remainder of 112.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 1284 from 1396 to get 112.
Append the next digit (6) from the dividend to 112 and continue with: 1126 / 428

On to step 5:
The number 428 fits into 1126 2 times, leaving a remainder of 270.
Record the quotient 2 as the next digit in the result. 
Result so far: 32.0
Subtract 856 from 1126 to get 270.
Grab the next digit (0) from the dividend, add it to 270, then carry on: 2700 / 428

Moving on to step 6:
The number 428 fits into 2700 6 times, leaving a remainder of 132.
Use 6 as the next digit of our solution. 
Result so far: 326.0
If we subtract 2568 from 2700, we get 132.
Bring next digit (4) of the dividend behind the 132 and repeat the process: 1324 / 428

On to step 7:
The number 428 fits into 1324 3 times, leaving a remainder of 40.
The next digit of our result is 3. 
Result so far: 3263.0
Deduct 1284 from 1324 and we're left with 40.
Include the next digit (0) from the dividend after 40, then repeat: 400 / 428

On to step 8:
When dividing 400 by 428, we get 0 with a remainder of 400.
Record the quotient 0 as the next digit in the result. 
Result so far: 32630.0
Deduct 0 from 400 and we're left with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Let's proceed to step 9:
4000 divided by 428 is 9 with a remainder of 148.
The next digit of our result is 9. 
Result so far: 32630.9
If we take 3852 away from 4000, we end up with 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Let's proceed to step 10:
If we divide 1480 by 428, we get 3 and a remainder of 196.
Write down 3 as next digit of the result. 
Result so far: 32630.93
If we subtract 1284 from 1480, we get 196.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

Step 11:
When dividing 1960 by 428, we get 4 with a remainder of 248.
Write down 4 as next digit of the result. 
Result so far: 32630.934
The remainder is 248 after subtracting 1712 from 1960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Advancing to step 12:
The number 428 fits into 2480 5 times, leaving a remainder of 340.
Write down 5 as next digit of the result. 
Result so far: 32630.9345
The remainder is 340 after subtracting 2140 from 2480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Let's proceed to step 13:
3400 divided by 428 is 7 with a remainder of 404.
Record the quotient 7 as the next digit in the result. 
Result so far: 32630.93457
If we take 2996 away from 3400, we end up with 404.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4040, and continue the process.

Moving on to step 14:
The number 428 fits into 4040 9 times, leaving a remainder of 188.
Use 9 as the next digit of our solution. 
Result so far: 32630.934579
The remainder is 188 after subtracting 3852 from 4040.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

On to step 15:
The number 428 fits into 1880 4 times, leaving a remainder of 168.
Write down 4 as next digit of the result. 
Result so far: 32630.9345794
If we take 1712 away from 1880, we end up with 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Advancing to step 16:
1680 divided by 428 is 3 with a remainder of 396.
Put 3 as the next digit of the answer. 
Result so far: 32630.93457943
If we take 1284 away from 1680, we end up with 396.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3960, and continue the process.

The final outcome is 32630.93457943, with a leftover of 3.96e-07.