BGCSE CORE
SIGNIFICANT FIGURES / ROUNDING
Many numbers are so large, small or have many decimal places, that it makes it hard to work with. It is easier to shorten the number to make it easier to read or write. This happens when we write numbers to a number of Significant figures OR we round a number to several decimal places.
Some things to remember about Significant Figures:
Any integers that are not zeros leading or trailing are significant (4.26 = 3sf)
A zero is significant if a non zero integer appears on either side of it (6.004 = 4sf)
A zero at the beginning of a number is not significant (0005 = 1sf 0.00022 = 2sf)
A zero after a decimal point is significant as they confirm the accuracy of the number (20.00 = 4sf)
Some things to remember about Significant Figures:
Any integers that are not zeros leading or trailing are significant (4.26 = 3sf)
A zero is significant if a non zero integer appears on either side of it (6.004 = 4sf)
A zero at the beginning of a number is not significant (0005 = 1sf 0.00022 = 2sf)
A zero after a decimal point is significant as they confirm the accuracy of the number (20.00 = 4sf)
SIGNIFICANT FIGURES
Vertical Divider
The first significant figure is the first
NONZERO digit. Each of the following are written to 1 significant digit 0.002 2 20 200 2000 Each of the following are written to 4 significant figures: 402.7 7001 1406 Each of the following is written to 5 significant figures: 62.000 2.6011 0.00020103 See an additional video for significant figures here 

rounding
The first significant figure is the first
NONZERO digit. Each of the following are written to 1 significant digit 0.002 2 20 200 2000 Each of the following are written to 4 significant figures: 402.7 7001 1406 Each of the following is written to 5 significant figures: 62.000 2.6011 0.00020103 Play a BASKETBALL GAME or SOCCER GAME with rounding to decimal places. 
