Scientific Notation (Use commas appropriately for numbers exceeding 1,000) - If the value given is a number, then write it in scientific notation. If the value given is expressed in scientific notation, then write it as a number. 4. 28,736,000,000 5. 1,000,000,000,000 6. 7,538,000 7. 4,742 8. 0.0000049328517 9. 6.242 x 107 10. 4.37 E+12 11. 5.39 x 10" From the Background, here are the rules for significant figures again: 1. Every nonzero digit in a recorded measurement is significant. 24.7 m, 0.743 m and 714 m all have three significant figures. 2. Zeroes appearing between nonzero digits are significant. The measurements 7003 m, 40.79 m and 1.503 m all have four significant figures. 3. Zeroes in front of (before) all nonzero digits are merely placeholders; they are not significant 0.0000099 only has two significant figures. 4 Zeroes at the end of the number if a decimal point is present and zeroes to the right of the decimal are significant. The measurements 1241.20 m, 210.100 m and 5600.00 all have six significant digits. 5. Zeroes at the end of a measurement and to the left of an omitted decimal point are ambiguous. They are not significant if they are only place holders: 6,000,000 live in New York-the zeroes are just to represent the magnitude of how many people are in N.Y. But the zeroes can be significant if they are the result of precise measurements. Rounding & Significant Figures (retain the following as whole or decimal numbers): 12. 47,830,000,000 to 2 significant figures 13. 35.6971 to 3 significant figures 14. 7.689 to nearest whole number