What should we estimate 0.69?

Answer 1

The front end estimate is 0.7, but estimating a single number, in isolation and without context, is a complete waste of time. It all comes down to the context of what needs to be done with the number.

If I had to add 0.69 to 1 trillion, I would estimate it as 0.
If I had to add 0.69 to 0.0000000001, I would use the number as given, or possibly the front end estimate. If I had to divide it by 10, I would estimate it as 0.7, because 0.7/10 = 0.07 If I had to divide it by 3, I would estimate it as 0.69, because 0.69/3 = 0.23

Answer 2

To the nearest tenth, 0.7