Rounding to Significant Figures Tips & Examples
How to round numbers to 1, 2, or 3 significant figures with clear guidelines and visual examples. Learn the importance of significant figures and how to round up or down based on the given numbers. Enhance your rounding skills with practical exercises and solutions.
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Presentation Transcript
Rounding To 1,2 or 3 Significant Figures
Significant Figures Important A significant number is any number that is not zero. Numbers e.g. 0.0001354 not significant Zero is only significant if it is surrounded by other numbers 1.0003658 significant
There should only be the number of significant figures asked for in the answer TOP TIP
Round to 1 significant figure 4720 U H 2 0 7 hundreds T Th 4 units thousands tens 1) Count 1 significant figure and draw a line on the right 2) Is the number on the right 5 or bigger? 3) YES, so round up 5000 Only 1 number 4720
Round to 1 significant figure 0.019 1/1000 1/10 1 9 tenths 0 decimal point .. U 0 1/100 thousandths units hundredths hundredths 1) The 1 is the first significant figure, draw a line on the right of it 2) Is the number on the right 5 or bigger? 3) YES, so round up 0.02 Only 1 number 0.019
Round to 2 significant figures 4732 U H 3 2 7 hundreds T Th 4 units thousands tens 1) Count 2 significant figures and draw a line on the right 2) Is the number on the right 5 or bigger? 3) NO, so round down4700 Only 2 numbers 4732
Round to 2 significant figures 0.279 1/1000 1/10 7 9 2 decimal point .. U 0 1/100 thousandths units tenths hundredths hundredths 1) The 7 is the second significant figure, draw a line on the right of it 2) Is the number on the right 5 or bigger? 0.279 0.28 3) YES, so round up Only 2 numbers
Round to 3 significant figures 9835 U H 3 5 8 hundreds T Th 9 units thousands tens 1) Count 3 significant figures and draw a line on the right 2) Is the number on the right 5 or bigger? 3) YES, so round up 9840 Only 3 numbers 9835
Round to 3 significant figures 18.43 1/10 4 3 8 units .. T U 1/100 hundredths 1 tens tenths decimal point 1) The 4 is the third significant figure, draw a line on the right of it 2) Is the number on the right 5 or bigger? 18.43 18.4 3) No, so round down Only 3 numbers
