21150978 ÷ 423 
The aim is to understand the frequency of 423 in 21150978.

Let's proceed to step 1:
The number 423 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 423

On to step 2:
423 can be fit into 21 0 times, resulting in a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Append the next digit (1) from the dividend to 21 and continue with: 211 / 423

Moving on to step 3:
When dividing 211 by 423, we get 0 with a remainder of 211.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 211 to get 211.
Fetch the next digit (5) from the dividend, attach it to 211 and continue: 2115 / 423

Let's proceed to step 4:
The number 423 fits into 2115 5 times, leaving a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
The remainder is 0 after subtracting 2115 from 2115.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 423

Let's proceed to step 5:
If we divide 0 by 423, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 50.0
Subtracting 0 from 0 leaves us with 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 423

On to step 6:
The number 423 fits into 9 0 times, leaving a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 500.0
Deduct 0 from 9 and we're left with 9.
Append the next digit (7) from the dividend to 9 and continue with: 97 / 423

Step 7:
423 goes into 97 0 times with a remainder of 97.
Use 0 as the next digit of our solution. 
Result so far: 5000.0
If we take 0 away from 97, we end up with 97.
Append the next digit (8) from the dividend to 97 and continue with: 978 / 423

Advancing to step 8:
423 goes into 978 2 times with a remainder of 132.
The next digit of our result is 2. 
Result so far: 50002.0
The remainder is 132 after subtracting 846 from 978.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

Going ahead to step 9:
When dividing 1320 by 423, we get 3 with a remainder of 51.
The next digit of our result is 3. 
Result so far: 50002.3
Subtract 1269 from 1320 to get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Going ahead to step 10:
510 divided by 423 is 1 with a remainder of 87.
Put 1 as the next digit of the answer. 
Result so far: 50002.31
If we subtract 423 from 510, we get 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Let's proceed to step 11:
When dividing 870 by 423, we get 2 with a remainder of 24.
Use 2 as the next digit of our solution. 
Result so far: 50002.312
Subtract 846 from 870 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Let's proceed to step 12:
423 can be fit into 240 0 times, resulting in a remainder of 240.
Put 0 as the next digit of the answer. 
Result so far: 50002.312
Subtract 0 from 240 to get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Step 13:
When dividing 2400 by 423, we get 5 with a remainder of 285.
The next digit of our result is 5. 
Result so far: 50002.31205
The remainder is 285 after subtracting 2115 from 2400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2850, and continue the process.

Advancing to step 14:
The number 423 fits into 2850 6 times, leaving a remainder of 312.
The number 6 becomes the next digit in our result. 
Result so far: 50002.312056
Subtracting 2538 from 2850 leaves us with 312.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

Advancing to step 15:
423 can be fit into 3120 7 times, resulting in a remainder of 159.
Write down 7 as next digit of the result. 
Result so far: 50002.3120567
The remainder is 159 after subtracting 2961 from 3120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

Advancing to step 16:
If we divide 1590 by 423, we get 3 and a remainder of 321.
The next digit of our result is 3. 
Result so far: 50002.31205673
Subtract 1269 from 1590 to get 321.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3210, and continue the process.

After the division, we end up with 50002.31205673 and a remainder of 3.21e-07.