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MJ2 Ch 1.9 – Scientific Notation & Quiz #2 Bellwork • Please take out your assignment from yesterday and leave it on your desk for me to check. • Convert the measurements: 1. 650 cm = _______m 2. 52L = _______kL 3. 2,500 mg = _______g Assignment Review • Workbook p. 37 Objective 1. Students will demonstrate understanding of converting metric measurement 2. Students will write numbers in scientific and standard form Quiz • Please take out a sheet of paper, pencil, and your calculator and text book…then clear your desk • In the upper right hand corner of your paper write your name, today's date/period & Quiz #2 (No heading & No pencil will result in a 1 letter grade deduction EACH for this quiz) • Today you will have a quiz on converting metric measurement. Quiz • 5 questions = 20 points each • You may use the FCAT conversion chart at the back of your text book • Number each problem • You do not have to write the question • Circle your answer • Show all work (No work = No credit) Quiz 1. 2. 3. 4. 5. Each morning Carlos runs 1.5 kilometers. How many meters did he run? A soda can contains 355 milliliters of liquid. How many liters of liquid does it contain? For 11 – 14 year olds, the recommended Dietary Allowance (RDA) for protein is about 60 grams. How many milligrams do they need daily? A helicopter was flying 800 meters above the ground. How many kilometers above the ground was it flying? A water sprinkler sprays about 150 liters of water each hour. How many kiloliters of water does it spray? Quiz Answers 1. 2. 3. 4. 5. 1,500 m 0.355 L 60,000 mg 0.8 km 0.15 kL After the Quiz… • Please pass your answer sheets forward… • Then take out your notebook and get ready to work… • Today we will look at numbers in scientific notation and standard form… • Raise your hand if you can explain why we need to know how to do this…. Objective • Students will express numbers in scientific notation CONVERTING FROM SCIENTIFIC NOTATION TO STANDARD FORM Positive Exponents • Positive Exponent – If the scientific notation has a positive exponent move the decimal the # of spaces of the exponent to the RIGHT • Example: 5.34 x 104 5.3400 = 53,400 Starting at the decimal point move it 4 spaces to the RIGHT Negative Exponents • Negative Exponent – If the scientific notation has a negative exponent, move the decimal the # of spaces of the exponent to the LEFT • Example: 3.27 x 10-3 003.27 = .00327 Starting at the decimal point move it 4 spaces to the LEFT Your Turn • 1. 2. 3. 4. In the notes section of your notebook write and complete the following problems. 6.7 x 103 8.325 x 108 7.218 x 10 -6 2.700 x 10 -4 CONVERTING FROM STANDARD FORM TO SCIENTIFIC NOTATION Scientific Notation • A number is expressed in scientific notation when it is written as the product of a factor and a power of 10. The factor must be greater than or equal to 1 and less then 10 • Lets look at an examples with positive and negative exponents… Positive Exponent 3,725,000 1. Place a decimal point between 3 & 7 2. Count the number digits from the decimal to the end of the number going right 3. Drop all zeros in the number and write as a power of 10 3,725,000 = 3.725 x 106 Negative Exponent 0.000316 1. If the standard form number is less than 1 you will have a negative exponent. 2. Place the decimal between the 3 & 1 3. Count the number of digits from the original decimal to the new decimal place 4. Restate the number as a power of 10 0.000316 = 3.16 x 10-4 Your Turn • 1. 2. 3. 4. In the notes section of your notebook write and covert the following to scientific notation 43,000 52,300,000 0.00072 0.0000901 Summary • In the notes section of your notebook summarize key concepts covered in today’s lesson • Today we discussed: • Converting from scientific notation to standard form • Converting from standard form to scientific notation Assignment • Text p. 45 # 10 – 36 Reminder • I do not accept answers only! • You must write the problem & answer • Check the answers to the odd problems with the answers in the back of the text book.