What are Significant Figures?
Start counting from the very first number
What are the two rules for Significant Figures?
Miss out the 0 at the start
For large number add 0 for any numbers before decimal places
What is 16.32 (2 s.f)?
16
What is 261.78 (1 s.f)?
300
How do you round?
If the next number is 5 or higher we round up otherwise we round down
What is 18.724 (1 d.p)?
18.7
What is 248.96372 (3 d.p)
248.964