Unit 2. Day 19..

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Presentation transcript:

Unit 2. Day 19.

Get into Groups

S.78 Exercise 3 a, b, c, d, e, f

3a) If Tamara Jones writes a check to pay for the plants, what is the resulting change in her checking account balance? −4.25 ∙ 2 = −8.50

3c) Jeremy’s sister, Susie, borrowed the money from their mom to pay for her order. Their mother has agreed to deduct an equal amount of money from Susie’s allowance each week for the next five weeks to repay the loan. What is the weekly change in Susie’s allowance? 2.50 ÷ 5 = −0.50

3d) Jeremy’s grandparents want to change their order 3d) Jeremy’s grandparents want to change their order. They want to order three daisies and one geranium, instead of four daisies. How does this change affect the amount of their order? Explain how you arrived at your answer. 15.00 − 13.50 Original order: 1.50 ∙ New order: 3.75 3 + 2.25 ∙ 1 11.25 + 2.25 = 13.50 $15.00

3e) Jeremy approaches three people who do not want to buy any plants; however, they wish to donate some money for the fundraiser when Jeremy delivers the plants one week later. If the people promise to donate a total of $14.40, what will be the average cash donation? 14.40 ÷ 3 = 4.80

3f) Jeremy spends one week collecting orders 3f) Jeremy spends one week collecting orders. If 22 people purchase plants totaling $270, what is the average amount of Jeremy’s sale? 270 ÷ 22 = 12.27 12.27272727…

Mr. Jordan can bench-press 30 2 5 kilograms. Mr Mr. Jordan can bench-press 30 2 5 kilograms. Mr. Yost can bench-press 114 kilograms. Mr. Yost can bench-press how many times more than Mr. Jordan? 30 2 5 114 ÷ = 114 1 152 5 ÷ = 114 1 5 152 570 152 2∙3∙5∙19 2∙2∙2∙19 15 4 3 3 4 ∙ = = = =

The three seventh grade math classes at Ramstein Middle School collected the most boxtops for a school fundraiser, and so they won a $600 prize to share among them. Ms. Ritters’ class collected 3,760 box tops, Mr. Mai’s class collected 2,301, and Mr. Jordan’s class collected 1,855. How should they divide the money so that each class gets the same fraction of the prize money as the fraction of the box tops that they collected?

$600 + 7916 Ms. Ritters’ class: 3,760 Mr. Mai’s class: 2,301 Mr. Jordan’s class: 1,855 3,760 2,301 1,855 3760 2301 $600 + 1855 7916 7916 ≈ 285 ≈ 0.475 ∙ 600 7916 ≈ 174.60 ≈ 0.291 ∙ 600 7916 140.40 ≈ 0.234 ∙ 600 ≈

Fill in the blanks with two rational numbers (other that -1 and 1) Fill in the blanks with two rational numbers (other that -1 and 1). What must be true about the relationship you chose? × − 1 3 =−15 _______× − 1 3 × ______ =−15 9, 5 −9, −5 1 −45 −15 1 −5 1 −9 1 −3 1 15 1 3 1 5 1 9 1 3, 15 −45 3 = −3, −15

In Mr. Jordan’s class, 4 5 of the students have passing grades (A, B, C). One-eigth of the passing students have an A. What fraction of Mr. Jordan’s students have an A? 4 5 1 8 4 40 2∙2 2∙2∙2∙5 1 10 ∙ = = =