1. Happy Thursday! Get out a sheet of paper and get ready for Warm up #1 Get out your notes and get ready to add to the conversions/sig fig notes Quiz Friday Test : September 10 th

2. Warm up #1 You and a group of friends are trying to measure how many jellybeans will fit in an empty peanut butter jar. You find that 738 fit in your jar. Friend #1 finds that 1135 fit in his jar, and friend #2 finds that 1304 fit into her jar. According to your teacher (who is never wrong!) the answer should be “about 900”. Are your group’s measurements precise? Why or why not? No: the range is greater than 1 Are they accurate? Why or why not? No: the average is off by more than 1

3. The last of the sig fig notes! Calculations with significant figures: When multiplying or dividing, your answer can contain no more significant figures than the least accurate measurement. Example: 56.78 cm x 2.45cm = Which number has the LEAST significant figures? How many sig figs does it have? 3 Your answer = 139 cm 2 (3 sig figs)

4. Adding and Subtracting sig figs Your answer can have no more DECIMAL places than the number with the least amount of DECIMAL places Ex: 123.56 + 22.1 – 15.853= Which one has the fewest decimal places? Your answer can only have 1 digit after the decimal Ans: 129.807 Final answer: 129.8

5. WHITEBOARD PRACTICE!!! Put your phones away!

6. Is a millimeter bigger than or smaller than a meter? Smaller How many millimeters does it take to make a meter? 1000 What unit do we use for mass in Physics? Kilogram What unit do we use to measure length in Physics? meter

7. How many sig figs here? 1.2 2100 56.76 4.00 0.0792 6,049,500,000 0.050 2 2 4 3 3 5 2

8. 73,680 cm equals how many kilometers? Ans: 0.7368 km Convert 85 kilometers to millimeters Ans: 85 000 000 mm or 8.5 x 10 7 mm How many Megameters are in 1,000,000 meters? Ans: 1Mm Convert 85 kilograms to centigrams Ans: 8,500,000 cg or 8.5 x 10 6 cg How many meters are in 53,401  m? Ans:.0534 m or 5.34 x 10 -2 m

9. How many sig figs here? 3401 2100 2100.0 5.00 0.00412 8,000,050,000 0.08030 4 2 5 3 3 6 4

10. How many seconds are there in 2 years? Ans: 63 072 000 seconds How many kilometers are in 351 centimeters? 0.000 351 kilometers How many meters are in 40 kilometers? 40 000 meters What is the area of a rectangle whose height is 25 cm and it’s width is 17 cm? Show your answer in meters. 4.25 m 2

11. What is the volume of a rectangle whose length is 14 cm, width is 22 cm and height is 13 cm? (Report your answer in cm) 4004 cm 3 Convert 15 km to cm. 1, 500, 000 centimeters Change the above answer (1,500,000) from standard notation to scientific notation. 1.5 x 10 6 cm