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© 2007 M. Tallman Jenny uses ¼ of her flour to make cookies. She had X cups of flour. How many cups of flour did she use? There are 640 students in a.

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Presentation on theme: "© 2007 M. Tallman Jenny uses ¼ of her flour to make cookies. She had X cups of flour. How many cups of flour did she use? There are 640 students in a."— Presentation transcript:

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2 © 2007 M. Tallman

3 Jenny uses ¼ of her flour to make cookies. She had X cups of flour. How many cups of flour did she use? There are 640 students in a school. If there are s students in each classroom, how many classrooms are there ? f = X × ¼ c = s ÷ 640

4 © 2007 M. Tallman Kelly eats.5 of her birthday cake. Her cake was divided into y equal pieces. How many pieces did she eat? Megan has 48 pieces of candy. There are x pieces in a box. How many boxes of candy does she have? p = y ×.5 b = x ÷ 48

5 © 2007 M. Tallman t × 6 6t 11 × b 11b c × 7 7c 22 × f 22f

6 © 2007 M. Tallman ) 9 3 ) 12 4 9 3 4 3 ways to represent a division in math… fraction division bar 12 ÷ 49 ÷ 3 symbol

7 © 2007 M. Tallman b ÷ 7 55 ÷ p r ÷ 8 9 ÷ f b 7 p 55 r 8 9 f

8 x5g 7x5g Evaluate means solve. g,=7 x5g = 35

9 21÷3c ÷3c Evaluate means solve. c,= ÷3c = 7

10 q x 6, q = 8 p ÷ 8, p = 56 2 ½ x f, f = 2 b ÷ 3.5, b = 7 28 ÷ y, y = 7 48 7 5 2 4

11 © 2007 M. Tallman ? Justin purchases 4 new books every month. How many books will he have after 4 months ? 28 1 Month 2 Months 3 Months4 Months O Months 16 4 7 12 3 82 41 00 bm m = months b = books Rule ? Rule: b = m x 4 or, m = b ÷ 4

12 © 2007 M. Tallman Rule: b = m x 4 or, m = b ÷ 4 (b = 4m) (m = ) b 4 28 16 4 7 12 3 82 41 00 bm b = books m = months Use the function rules to answer these questions: How many books will Justin have after 10 months? Justin has 32 books. How many months have passed? How many books will Justin have after 6 months? Justin has 48 books. How many months have passed? 40 8 24 12

13 © 2007 M. Tallman 126 105 84 63 42 21 # of Cubes (c) Element # (e) 1 2 3 45 6 Rule: c = e × 2or, e = c ÷ 2 Rule ?

14 © 2007 M. Tallman Rule: c = e x 2 or, e = c ÷ 2 (c = 2e) (e = ) c 2 Use the function rules to answer these questions: How many cubes are in element 24? Which element has 36 cubes? How many cubes are in element 50? Which element has 90 cubes? 48 18 100 45 126 105 84 63 42 21 # of Cubes (c) Element # (e)


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