[blindguyinanorg]

1314.459 + 3.01=1317.47
23.15 * 5.2 = 120 (2 sig digs)
29.87777 / 2.0 = 15
31.7 * sin(76)=30.3
pi * 2.3=7.2
( 2.765 + 4.1 ) / ( squrt(3*sin(55)))=3----1 sig dig(the 3 is only one sig dig)

for multiplication and division it is the total number of digits in the smallest number

for addition it is the highest place value (1200 would be 2 where as 1200.1 would be 5)

you do all arithmatic first then either round or truncate to correct digits

i am absolutly sure about this, i was the only one in my class (gifted) who could even understand why this is so.