15974339 ÷ 251 
We want to figure out the number of times 15974339 can be divided by 251.

Step 1:
If we divide 1 by 251, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 251

Let's proceed to step 2:
If we divide 15 by 251, we get 0 and a remainder of 15.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 15, we get 15.
Grab the next digit (9) from the dividend, add it to 15, then carry on: 159 / 251

Moving on to step 3:
159 divided by 251 is 0 with a remainder of 159.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 159 leaves us with 159.
Append the next digit (7) from the dividend to 159 and continue with: 1597 / 251

Going ahead to step 4:
If we divide 1597 by 251, we get 6 and a remainder of 91.
Put 6 as the next digit of the answer. 
Result so far: 6.0
If we take 1506 away from 1597, we end up with 91.
Fetch the next digit (4) from the dividend, attach it to 91 and continue: 914 / 251

On to step 5:
914 divided by 251 is 3 with a remainder of 161.
The number 3 becomes the next digit in our result. 
Result so far: 63.0
Subtracting 753 from 914 leaves us with 161.
Bring next digit (3) of the dividend behind the 161 and repeat the process: 1613 / 251

On to step 6:
If we divide 1613 by 251, we get 6 and a remainder of 107.
The number 6 becomes the next digit in our result. 
Result so far: 636.0
Deduct 1506 from 1613 and we're left with 107.
Grab the next digit (3) from the dividend, add it to 107, then carry on: 1073 / 251

Going ahead to step 7:
251 goes into 1073 4 times with a remainder of 69.
Record the quotient 4 as the next digit in the result. 
Result so far: 6364.0
If we subtract 1004 from 1073, we get 69.
Fetch the next digit (9) from the dividend, attach it to 69 and continue: 699 / 251

On to step 8:
The number 251 fits into 699 2 times, leaving a remainder of 197.
Record the quotient 2 as the next digit in the result. 
Result so far: 63642.0
The remainder is 197 after subtracting 502 from 699.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1970, and continue the process.

Moving on to step 9:
1970 divided by 251 is 7 with a remainder of 213.
Use 7 as the next digit of our solution. 
Result so far: 63642.7
Deduct 1757 from 1970 and we're left with 213.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2130, and continue the process.

Advancing to step 10:
251 goes into 2130 8 times with a remainder of 122.
Put 8 as the next digit of the answer. 
Result so far: 63642.78
Subtracting 2008 from 2130 leaves us with 122.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

Let's proceed to step 11:
If we divide 1220 by 251, we get 4 and a remainder of 216.
The number 4 becomes the next digit in our result. 
Result so far: 63642.784
The remainder is 216 after subtracting 1004 from 1220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

On to step 12:
251 can be fit into 2160 8 times, resulting in a remainder of 152.
The number 8 becomes the next digit in our result. 
Result so far: 63642.7848
Subtracting 2008 from 2160 leaves us with 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1520, and continue the process.

On to step 13:
251 goes into 1520 6 times with a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 63642.78486
If we subtract 1506 from 1520, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 14:
251 goes into 140 0 times with a remainder of 140.
The number 0 becomes the next digit in our result. 
Result so far: 63642.78486
If we take 0 away from 140, we end up with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Let's proceed to step 15:
When dividing 1400 by 251, we get 5 with a remainder of 145.
Put 5 as the next digit of the answer. 
Result so far: 63642.7848605
If we subtract 1255 from 1400, we get 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Going ahead to step 16:
251 can be fit into 1450 5 times, resulting in a remainder of 195.
Use 5 as the next digit of our solution. 
Result so far: 63642.78486055
If we take 1255 away from 1450, we end up with 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

After the division, we end up with 63642.78486055 and a remainder of 1.95e-07.