1. Rounded Off Values
Upper and Lower Bounds

2. This is the upper bound of of the measurement
Q What’s the biggest actual value 2.4m (to nearest 0.1m)
can have?
The biggest number that would round down to 2.4m
We might as well call it 2.45m!
A ……m
This is the upper bound of of the measurement

3. The smallest number that would round up to 2.4m
Q What’s the smallest actual value 2.4m (to nearest 0.1m) can have?
A 2.35m
The smallest number that would round up to 2.4m
This is the lower bound of the measurement

4. A real value can be as much as HALF THE ROUNDED UNIT above or below the rounded-off value

5. Answer: 775g <= 780g < 785g Example
What are the upper and lower bounds of 780g (2 sf)?
Answer:
775g <= 780g < 785g