Originally Posted by

**willy0625** Hi.

I would like to ask those that have done a bit on computational Maths.

I thought I understood it but my lecture notes gives another example and i don't get it:

It reads:

**actual value = 23.496 and estimate = 23.494**

The the error is |actual - estimate|= 0.002.

**The actual value has four significant digits with respect to actual value , since the error is less**

**than 5 in the fifth place to the right of the first nonzero digit in actual . Note that if estimate**

**is rounded to four places, an additional error is introduced and estimate will no longer have four significant digits.**

What does even this mean? I don't get it. Please someone explain for me.