10274036 ÷ 643 
The aim is to understand the frequency of 643 in 10274036.

On to step 1:
If we divide 1 by 643, we get 0 and a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 643

Let's proceed to step 2:
643 can be fit into 10 0 times, resulting in a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 10, we get 10.
Include the next digit (2) from the dividend after 10, then repeat: 102 / 643

Going ahead to step 3:
The number 643 fits into 102 0 times, leaving a remainder of 102.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 102, we end up with 102.
Take the next digit (7) from the dividend and append it to 102, then repeat: 1027 / 643

Going ahead to step 4:
643 goes into 1027 1 times with a remainder of 384.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 643 from 1027 and we're left with 384.
Append the next digit (4) from the dividend to 384 and continue with: 3844 / 643

Let's proceed to step 5:
When dividing 3844 by 643, we get 5 with a remainder of 629.
The next digit of our result is 5. 
Result so far: 15.0
Subtract 3215 from 3844 to get 629.
Grab the next digit (0) from the dividend, add it to 629, then carry on: 6290 / 643

On to step 6:
6290 divided by 643 is 9 with a remainder of 503.
Put 9 as the next digit of the answer. 
Result so far: 159.0
Deduct 5787 from 6290 and we're left with 503.
Bring next digit (3) of the dividend behind the 503 and repeat the process: 5033 / 643

Let's proceed to step 7:
643 goes into 5033 7 times with a remainder of 532.
Write down 7 as next digit of the result. 
Result so far: 1597.0
If we subtract 4501 from 5033, we get 532.
Fetch the next digit (6) from the dividend, attach it to 532 and continue: 5326 / 643

Going ahead to step 8:
When dividing 5326 by 643, we get 8 with a remainder of 182.
Record the quotient 8 as the next digit in the result. 
Result so far: 15978.0
The remainder is 182 after subtracting 5144 from 5326.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1820, and continue the process.

On to step 9:
The number 643 fits into 1820 2 times, leaving a remainder of 534.
Put 2 as the next digit of the answer. 
Result so far: 15978.2
Subtracting 1286 from 1820 leaves us with 534.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5340, and continue the process.

Moving on to step 10:
If we divide 5340 by 643, we get 8 and a remainder of 196.
The number 8 becomes the next digit in our result. 
Result so far: 15978.28
Subtracting 5144 from 5340 leaves us with 196.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

Let's proceed to step 11:
If we divide 1960 by 643, we get 3 and a remainder of 31.
Record the quotient 3 as the next digit in the result. 
Result so far: 15978.283
The remainder is 31 after subtracting 1929 from 1960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Advancing to step 12:
643 can be fit into 310 0 times, resulting in a remainder of 310.
Put 0 as the next digit of the answer. 
Result so far: 15978.283
The remainder is 310 after subtracting 0 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

On to step 13:
If we divide 3100 by 643, we get 4 and a remainder of 528.
Record the quotient 4 as the next digit in the result. 
Result so far: 15978.28304
If we subtract 2572 from 3100, we get 528.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

Advancing to step 14:
The number 643 fits into 5280 8 times, leaving a remainder of 136.
The next digit of our result is 8. 
Result so far: 15978.283048
The remainder is 136 after subtracting 5144 from 5280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Going ahead to step 15:
643 can be fit into 1360 2 times, resulting in a remainder of 74.
Put 2 as the next digit of the answer. 
Result so far: 15978.2830482
The remainder is 74 after subtracting 1286 from 1360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Going ahead to step 16:
If we divide 740 by 643, we get 1 and a remainder of 97.
Write down 1 as next digit of the result. 
Result so far: 15978.28304821
Deduct 643 from 740 and we're left with 97.
Since there are no more digits in the dividend, we add a zero to the remainder making it 970, and continue the process.

The final outcome is 15978.28304821, with a leftover of 9.7e-08.