We divide 147458 by 21
We want to figure out the number of times 147458 can be divided by 21.

On to step 1:
1 divided by 21 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 21

Step 2:
21 goes into 14 0 times with a remainder of 14.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 14 to get 14.
Take the next digit (7) from the dividend and append it to 14, then repeat: 147 / 21

Advancing to step 3:
If we divide 147 by 21, we get 7 and a remainder of 0.
Write down 7 as next digit of the result. 
Result so far: 7.0
Subtracting 147 from 147 leaves us with 0.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 21

Moving on to step 4:
The number 21 fits into 4 0 times, leaving a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 70.0
Subtracting 0 from 4 leaves us with 4.
Grab the next digit (5) from the dividend, add it to 4, then carry on: 45 / 21

Step 5:
21 goes into 45 2 times with a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 702.0
The remainder is 3 after subtracting 42 from 45.
Bring next digit (8) of the dividend behind the 3 and repeat the process: 38 / 21

On to step 6:
When dividing 38 by 21, we get 1 with a remainder of 17.
The next digit of our result is 1. 
Result so far: 7021.0
The remainder is 17 after subtracting 21 from 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 7:
If we divide 170 by 21, we get 8 and a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 7021.8
If we take 168 away from 170, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 8:
21 goes into 20 0 times with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 7021.8
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 9:
21 goes into 200 9 times with a remainder of 11.
The next digit of our result is 9. 
Result so far: 7021.809
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 10:
21 goes into 110 5 times with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 7021.8095
The remainder is 5 after subtracting 105 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 11:
When dividing 50 by 21, we get 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 7021.80952
Deduct 42 from 50 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 12:
21 goes into 80 3 times with a remainder of 17.
The next digit of our result is 3. 
Result so far: 7021.809523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 13:
170 divided by 21 is 8 with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 7021.8095238
Deduct 168 from 170 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 14:
20 divided by 21 is 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 7021.8095238
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final outcome is 7021.8095238, with a leftover of 2e-08.