No.
Yes
4 is the exact answer.
Yes. This is because 158 is approximately 160 and 41 is approximately 40. 160/40 = 4, therefore 4 is a good estimate of 158/41.
Yes.
Tony
If I assume that you're talking about 158 / 41 then my quick answer is yes, it is a good estimate. 4 times 41 is 164 which is closer to 158 than 3 times 41 (123) and 5 times 41 (205). Final summary: 4 is a good estimate for 158 / 41 because it is the closest whole number to the real answer.
It is 4 + 10 = 14
You don't need to estimate! The exact value is easy. 0.4 = 4/10 which is 2/5
0.75 is a good estimate.
4 metres is the only sensible estimate.
the answer would have had 5 digits
I would estimate that your chances are pretty good.