39405979 ÷ 978 
Let's see how many times 978 fits into 39405979.

Moving on to step 1:
3 divided by 978 is 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 978

Going ahead to step 2:
39 divided by 978 is 0 with a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 39 to get 39.
Grab the next digit (4) from the dividend, add it to 39, then carry on: 394 / 978

Going ahead to step 3:
When dividing 394 by 978, we get 0 with a remainder of 394.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 394 and we're left with 394.
Take the next digit (0) from the dividend and append it to 394, then repeat: 3940 / 978

Going ahead to step 4:
If we divide 3940 by 978, we get 4 and a remainder of 28.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtracting 3912 from 3940 leaves us with 28.
Include the next digit (5) from the dividend after 28, then repeat: 285 / 978

On to step 5:
978 goes into 285 0 times with a remainder of 285.
The number 0 becomes the next digit in our result. 
Result so far: 40.0
Subtract 0 from 285 to get 285.
Grab the next digit (9) from the dividend, add it to 285, then carry on: 2859 / 978

On to step 6:
2859 divided by 978 is 2 with a remainder of 903.
Put 2 as the next digit of the answer. 
Result so far: 402.0
If we take 1956 away from 2859, we end up with 903.
Take the next digit (7) from the dividend and append it to 903, then repeat: 9037 / 978

Step 7:
When dividing 9037 by 978, we get 9 with a remainder of 235.
Record the quotient 9 as the next digit in the result. 
Result so far: 4029.0
Subtracting 8802 from 9037 leaves us with 235.
Append the next digit (9) from the dividend to 235 and continue with: 2359 / 978

Step 8:
978 can be fit into 2359 2 times, resulting in a remainder of 403.
Put 2 as the next digit of the answer. 
Result so far: 40292.0
If we subtract 1956 from 2359, we get 403.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4030, and continue the process.

Moving on to step 9:
4030 divided by 978 is 4 with a remainder of 118.
Put 4 as the next digit of the answer. 
Result so far: 40292.4
Subtracting 3912 from 4030 leaves us with 118.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1180, and continue the process.

Going ahead to step 10:
1180 divided by 978 is 1 with a remainder of 202.
The next digit of our result is 1. 
Result so far: 40292.41
Subtract 978 from 1180 to get 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

On to step 11:
The number 978 fits into 2020 2 times, leaving a remainder of 64.
Write down 2 as next digit of the result. 
Result so far: 40292.412
The remainder is 64 after subtracting 1956 from 2020.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Moving on to step 12:
If we divide 640 by 978, we get 0 and a remainder of 640.
Record the quotient 0 as the next digit in the result. 
Result so far: 40292.412
Deduct 0 from 640 and we're left with 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Moving on to step 13:
If we divide 6400 by 978, we get 6 and a remainder of 532.
Write down 6 as next digit of the result. 
Result so far: 40292.41206
The remainder is 532 after subtracting 5868 from 6400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5320, and continue the process.

Step 14:
978 goes into 5320 5 times with a remainder of 430.
Write down 5 as next digit of the result. 
Result so far: 40292.412065
If we take 4890 away from 5320, we end up with 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

Let's proceed to step 15:
If we divide 4300 by 978, we get 4 and a remainder of 388.
Record the quotient 4 as the next digit in the result. 
Result so far: 40292.4120654
The remainder is 388 after subtracting 3912 from 4300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3880, and continue the process.

Moving on to step 16:
If we divide 3880 by 978, we get 3 and a remainder of 946.
The next digit of our result is 3. 
Result so far: 40292.41206543
If we subtract 2934 from 3880, we get 946.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9460, and continue the process.

The final outcome is 40292.41206543, with a leftover of 9.46e-07.