Chopping arithmetic I would like to use chopping arithmetic for 3 digit chopping for the following: $a)\pi$ and $b) 456788.1234567$ My guess is that it is $3.141$ and $456788.123$, but my book says the pi after chopping is $3.14$. I'm wondering if that's right since if I used same logic for a big number, like my second example, I'd get $456$, which is really different.

The answer for b) is 456000.
1) Count three digits including the first.
2) Keep the decimal point in the same place relative to the first digit.