42240 ÷ 8 = 5280 R0
Let's divide 42240 by 8.

Step 1:
8 goes into 4 0 times with a remainder of 4.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 4 to get 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 8

Step 2:
8 goes into 42 5 times with a remainder of 2.
Write down 5 as next digit of of the result. 
Result so far: 5
Subtract 40 from 42 to get 2.
Bring next digit (2) of the dividend behind the 2 and repeat the process: 22 / 8

Step 3:
8 goes into 22 2 times with a remainder of 6.
Write down 2 as next digit of of the result. 
Result so far: 52
Subtract 16 from 22 to get 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 8

Step 4:
8 goes into 64 8 times with a remainder of 0.
Write down 8 as next digit of of the result. 
Result so far: 528
Subtract 64 from 64 to get 0.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 8

Step 5:
8 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of of the result. 
Result so far: 5280
Subtract 0 from 0 to get 0.

The final result is 5280 with a remainder of 0.