64946431 ÷ 690 
The aim is to understand the frequency of 690 in 64946431.

Going ahead to step 1:
690 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 690

On to step 2:
690 can be fit into 64 0 times, resulting in a remainder of 64.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 64 leaves us with 64.
Grab the next digit (9) from the dividend, add it to 64, then carry on: 649 / 690

Going ahead to step 3:
690 goes into 649 0 times with a remainder of 649.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 649 after subtracting 0 from 649.
Include the next digit (4) from the dividend after 649, then repeat: 6494 / 690

Going ahead to step 4:
When dividing 6494 by 690, we get 9 with a remainder of 284.
The next digit of our result is 9. 
Result so far: 9.0
Deduct 6210 from 6494 and we're left with 284.
Grab the next digit (6) from the dividend, add it to 284, then carry on: 2846 / 690

Step 5:
When dividing 2846 by 690, we get 4 with a remainder of 86.
Use 4 as the next digit of our solution. 
Result so far: 94.0
Subtracting 2760 from 2846 leaves us with 86.
Take the next digit (4) from the dividend and append it to 86, then repeat: 864 / 690

Advancing to step 6:
690 goes into 864 1 times with a remainder of 174.
The number 1 becomes the next digit in our result. 
Result so far: 941.0
Subtract 690 from 864 to get 174.
Bring next digit (3) of the dividend behind the 174 and repeat the process: 1743 / 690

Let's proceed to step 7:
1743 divided by 690 is 2 with a remainder of 363.
Record the quotient 2 as the next digit in the result. 
Result so far: 9412.0
Subtract 1380 from 1743 to get 363.
Append the next digit (1) from the dividend to 363 and continue with: 3631 / 690

Step 8:
690 can be fit into 3631 5 times, resulting in a remainder of 181.
Put 5 as the next digit of the answer. 
Result so far: 94125.0
If we take 3450 away from 3631, we end up with 181.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1810, and continue the process.

Going ahead to step 9:
1810 divided by 690 is 2 with a remainder of 430.
Use 2 as the next digit of our solution. 
Result so far: 94125.2
Subtracting 1380 from 1810 leaves us 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.

Moving on to step 10:
When dividing 4300 by 690, we get 6 with a remainder of 160.
Use 6 as the next digit of our solution. 
Result so far: 94125.26
Deduct 4140 from 4300 and we're left with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Advancing to step 11:
1600 divided by 690 is 2 with a remainder of 220.
Use 2 as the next digit of our solution. 
Result so far: 94125.262
Subtract 1380 from 1600 to get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Going ahead to step 12:
690 can be fit into 2200 3 times, resulting in a remainder of 130.
Write down 3 as next digit of the result. 
Result so far: 94125.2623
The remainder is 130 after subtracting 2070 from 2200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Going ahead to step 13:
690 goes into 1300 1 times with a remainder of 610.
Use 1 as the next digit of our solution. 
Result so far: 94125.26231
Deduct 690 from 1300 and we're left with 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6100, and continue the process.

Advancing to step 14:
6100 divided by 690 is 8 with a remainder of 580.
Put 8 as the next digit of the answer. 
Result so far: 94125.262318
Subtracting 5520 from 6100 leaves us with 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Step 15:
690 goes into 5800 8 times with a remainder of 280.
The number 8 becomes the next digit in our result. 
Result so far: 94125.2623188
The remainder is 280 after subtracting 5520 from 5800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

After the division, we end up with 94125.2623188 and a remainder of 2.8e-06.