<p>More Sig Figs, and Scientific Notation Hopefully, this is starting to make sense but let’s make sure…</p><p>1. Which of the following is the best answer to 12 x 12 = ? A. 1 x 102</p><p>B. 1.4 x 102</p><p>C. 144</p><p>D. 144.0</p><p>2. Which of the following is the best answer to 9.1 x 15 = ? A. 1 x 102</p><p>B. 1.35 x 102</p><p>C. 1.4 x 102</p><p>D. 135</p><p>3. Which of the following is the best answer to 5,460 ÷ 39 = ? A. 1 x 102</p><p>B. 1.4 x 102</p><p>C. 144</p><p>D. 144.0</p><p>4. What is the relationship between the answers to all three of the above questions? Pretty interesting, right?</p><p>5. 3.14 represents “π to ______sig figs.”</p><p>6. π + 27 =</p><p>7. 1 x 2.456723189468238979874924 = (Don’t use your calculator!) Let’s look at addition and subtraction:</p><p>8. 145 lbs – 3.0 lbs = (Hint: Line up the decimal places like you did in elementary school)</p><p>9. 145 lbs – 0.4 lbs =</p><p>10. The Earth has a mass of 6.0 x 1024 kg. A 0.25 kg chinchilla is born. What is the new, total mass of the Earth/chinchilla system?</p><p>11. There are about 200 billion stars in our galaxy. One goes out. How many stars are left?</p>