•addition and subtraction…
•first add them
up! don’t worry about sigfigs until the
end!
•3.75 + 4.1 = 7.85
–you
can only go to where all numbers have something to contribute,
so can only go to 7.9
•3.987 + 4.60 =
8.587
–but can only
go to 0.01, so 8.59