It is 92/3.
With a little bit of effort you can work out the exact answer and do not need to estimate.
90/9 is 10.
But you want 87/9. The numerator is 3 less so the quotient will be 3/9 less. Now, 3/9 = 1/3. So the exact answer is 10 minus 1/3 which is 92/3. Not that hard, was it?
3.6667
170.8889
19.8889
9.6667
1.1154
9.6667
9.6667
9.6667
Answer is 43.4444
6 divided 87 = 0.06896551724137931
87/9=9.6 repeating, or 9.67
43.5