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# maths- ub and lb Watch

1. this topic really confuses me and it seems to be the only one i am struggling with right now
4.50 if rounded to 2dp, would the upper bound be 4.505 and the lower bound be 4.495?
80mm rounded to 1sf, would the upper bound be 85mm and the lower bound be 75mm?
2. (Original post by neharajput)
this topic really confuses me and it seems to be the only one i am struggling with right now
4.50 if rounded to 2dp, would the upper bound be 4.505 and the lower bound be 4.495?
80mm rounded to 1sf, would the upper bound be 85mm and the lower bound be 75mm?
A good way to think of this is to think about what does "rounded" mean?

If 4.50 is a number has been rounded that means the original number could be anywhere between 4.495 and 4.505 as any number between those two would be rounded to 4.5.

So 4.496 would get rounded to 4.50, 4.504 would get rounded to 4.50, etc...

So yes, 4.50 rounded to 2 d.p has a lower bound of 4.495 and an upper bound for 4.505.

By that logic, does your answer to the second question work? (it does)

Also, you're not the only one struggling, I've seen at least three/four different posts about this topic in the last few days.

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