Perhaps you may find some of the videos helpful.

Check out this Veritas video about the roundest object and the definition of the kilogram


Try this Kahn Academy video on identifying sig figs.


Continue with more sig fig instruction with this Kahn Academy video.


Learn to deal with rounding off when doing computations (add/subtract) to the correct number of significant figures with this Kahn Academy video.


Learn to deal with rounding off when doing computations (multiply and dividing) to the correct number of significant figures with this Kahn Academy video.


You may find this music video very corny, but a bit entertaining and helpful to know which numbers are significant figures, and which are not. I do disagree with using the bar over zeros (as shown at 2:05 MIN) to indicate significant figures. If we need to show zeros as sig figs, we will use scientific notation as shown in the Kahn video.


You may find this video helpful for learning to rounding off to the correct number of sig figs. The instruction is corny, but good − you will find one rounding error at 0.46 sec the calculation 33.7 + 1 = 34 not 33 and at 2.05 min 3.5 x 9.95 = 34.825 not 38.825 !