Significant Figures

Yesterday in class we learned about significant numbers. This was a difficult concept to learn because you have to overlook previous math knowledge. One of the most important things we learned during this lesson was the rules of significant numbers:
In the number:
0.004004500

• The first 0 is not significant and is only there for "cosmetic purposes"
• The next two zeros are not important either and are used only to locate the decimal points
• The non zero integers are significant
• All zeros in between the non zero numbers are significant
• Significant zeros to the numbers to the right of the decimal point

Here are some videos to help with this concept:
Video 1
Video 2
Sig Fig Song :)