Let's divide 21578010 by 745
The aim is to understand the frequency of 745 in 21578010.

Let's proceed to step 1:
If we divide 2 by 745, we get 0 and a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 745

Let's proceed to step 2:
745 goes into 21 0 times with a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Grab the next digit (5) from the dividend, add it to 21, then carry on: 215 / 745

On to step 3:
745 goes into 215 0 times with a remainder of 215.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 215, we get 215.
Fetch the next digit (7) from the dividend, attach it to 215 and continue: 2157 / 745

Moving on to step 4:
When dividing 2157 by 745, we get 2 with a remainder of 667.
Write down 2 as next digit of the result. 
Result so far: 2.0
The remainder is 667 after subtracting 1490 from 2157.
Grab the next digit (8) from the dividend, add it to 667, then carry on: 6678 / 745

On to step 5:
When dividing 6678 by 745, we get 8 with a remainder of 718.
Record the quotient 8 as the next digit in the result. 
Result so far: 28.0
Subtracting 5960 from 6678 leaves us with 718.
Include the next digit (0) from the dividend after 718, then repeat: 7180 / 745

Moving on to step 6:
745 can be fit into 7180 9 times, resulting in a remainder of 475.
The number 9 becomes the next digit in our result. 
Result so far: 289.0
If we subtract 6705 from 7180, we get 475.
Take the next digit (1) from the dividend and append it to 475, then repeat: 4751 / 745

Moving on to step 7:
When dividing 4751 by 745, we get 6 with a remainder of 281.
Use 6 as the next digit of our solution. 
Result so far: 2896.0
Subtracting 4470 from 4751 leaves us with 281.
Append the next digit (0) from the dividend to 281 and continue with: 2810 / 745

Step 8:
When dividing 2810 by 745, we get 3 with a remainder of 575.
The next digit of our result is 3. 
Result so far: 28963.0
If we take 2235 away from 2810, we end up with 575.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5750, and continue the process.

Let's proceed to step 9:
The number 745 fits into 5750 7 times, leaving a remainder of 535.
The number 7 becomes the next digit in our result. 
Result so far: 28963.7
Deduct 5215 from 5750 and we're left with 535.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5350, and continue the process.

On to step 10:
The number 745 fits into 5350 7 times, leaving a remainder of 135.
Record the quotient 7 as the next digit in the result. 
Result so far: 28963.77
Subtract 5215 from 5350 to get 135.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

The final outcome is 28963.77, with a leftover of 0.135.