1. 1 Press Ctrl-A ©G Dear 2010 – Not to be sold/Free to use SignificantFigures Stage 6 - Year 11 Mathematics

2. 2 non-zeroAll non-zero numbers are significant betweenzeros between non-zero digits are significant zeros at the end of a decimal are significant notall other zeros are not significant. 2971 32.5 7.456 3071 60.5 8.009 297.10 32.00 9.000 0900 0254 0.456 Practice Significant Figures

3. 3 1.The first significant figure is the first non-zero number from the left (underlined in red). Write 354 567 to 3 significant figures. 2. Underline the next 2 digits. 3. Looking at the next digit, underlined in blue. (Use 5/4 rounding to find the correct 3 rd digit.) The answer is 354 000, but 4. Since the 4 th digit is 5 or greater, round up. The answer is 355 000.

4. 4 1.The first significant figure is the first non-zero number from the left (underlined in red). Write 0.077 356 to 2 significant figures. 2. Underline the next digit. 3. Looking at the next digit, underlined in blue. (Use 5/4 rounding to find the correct 3 rd digit.) The answer is 0.077, but 4. Since the next digit is 5 or less, round down. The answer is 0.077. Significant Figures

5. 5 12345 2.340 Significant Figures

6. 6 12345 0.040 Significant Figures

7. 7 12345 2340 Significant Figures

8. 8 12345 120.34 Significant Figures

9. 9 12345 2020 Significant Figures