Exponents are shorthand for multiplication: (5) (5) = 52, (5) (5) (5) = 53. #1 a) #2 a) (4)(4)(4) b) c) d) The "exponent" stands for however many times the term is being multiplied. 5 3 (3 times) 5 x 5 x 5 = 125 The term that's being multiplied is called the "base". 5 3 b) (6)(6)(6)(6)(6) Can you see the difference? -42 (-4)2 (-1)2= (-1)3= (-1)4= (-1)5= . . . Did you see a pattern?? (-1)10247= (-1)29584= 29584 (-1) 10247 (-1) = -1 Check out pages 55 and 56. =1 Please complete questions... I Love Math! Evaluating powers when the base is negative... If the exponent is even the answer will be positive. If the exponent is odd the answer will be negative. Page 55 #9 Page 56 #11 12 13 14 15 16 WARM-UP 1. Write each power as repeated multiplication. 42 (5)6 2. Write each product as a power, then evaluate. 6 x 6 Write 25 as a power of 5. (4)(4)(4) 3. Predict whether each answer is positive or negative, then evaluate. 41 63 (3)5 (8)5 (3)10 4. Evaluate. 67 Me again... Try these! Express as a power of 2. Please complete questions... Page 56 #20 21 a 22 23 I Love Math! 4 = 2 16 = 2 8 = 2 128 = 2 21 10 3 10 5 0 10 10 0 35 For the following chart *choose a number between 1 and 10 as a base of a power *use your base and the exponent to fill in the power column *Write the repeated multiplication * Record your answer in standard form (answer you see on the calculator) 0 700 Avogadro's number = 6.0221415 × 1023 The speed of light = 2.99 792 458 × 108 m / s Temperature of the Sun's Core = 1.5 x 107 oC since 15000000 kelvin = 14999726.85 degree Celsius Distance related to Powers of 10 http://vimeo.com/819138 I picked 3 as my base 34 33 32 31 30 3 x 3 x 3 x 3 3 x 3 x 3 3 x 3 3 81 27 9 3 Try this Evaluate each expression *Image taken from "Math Makes Sense 9", page 59, copyright to pearson education Canada a) 50 b) (5)0 c) (5)0 d) 50 Any number (except 0) with an exponent 0 will equal 1 20 = 1 130 = 1 1990 =1 (6)0 = 1 Why??? Zero Exponent LAW A power with an interger base, not including 0, and an exponent of 0 is equal to 1 PRACTICE TIME A place value chart may help Page 61 62 Write 96 713 as a power of 10 Erase to see solutions 96 713 = 90 000 + 6000 + 700 + 10 + 3 = (9 x 10 000) + (6 x 1000) + (7 x 100) + (1 x 10) + (3 x1) = (9 x 104) + (6 x 103) + (7 x 102) + (1 x 101) + (3 x100) # 4(a, b) # 5(a, b, c, d) #6(a, c, e) #8( a, c, e) #9(a, c, e) #10 all #11 #13
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