rounding

Question 1

how do you find the error when rounding?

Answer 1

rounded value subtract actual value = error. e.g 500-478=22

Question 2

How do you find the range of values when given a rounded value?

Answer 2

Half the rounding value. subtract from the rounding value to find the smallest value and add to find the biggest value.

Question 3

how is the inequality expressed?

Answer 3

It is the range between the smallest value and the biggest value. e.g
9.15 < x < 9.25.

Question 4

what are the rules when estimating?

Answer 4

Round each number ( usually to one significant figure) and then work it out 63.26 x 13.12 = 60 x 10 = 600 = 30.