Today in class students learned a little bit about percentages. This was really fast and everyone should take a few minutes to look over the notes in the back of their workbook and let this sink in. We moved on to Lesson 7 with more practice adding and subtracting negative numbers. The main idea is to really think about what the negative numbers represent (like debt) so that it gets easier to add and subtract them.
Answers to HW: 1. a. $0.99 because 15⋅0.066=0.99 [Remember the answer should be less than $1.50] b. Answers vary. Sample response: I think Tyler should pay $19 in all, because that would cover his meal, the sales tax, and a 20% tip for the server. 2. seconds in circle health gained 4 100 10 250 3 75 40 1,000 3. a. 100 m, because 400+100=500 b. 900 m, because -400+900=500 c. -5,100 m, because 8,500+(-5,100)=3,400 d. -8,800 m, because 8,500+(-8,800)=-300 e. -650 m, because 450+(-650)=-200 [This one was worded very oddly, just find the difference] 4. transaction amount account balance 360 360 -22.50 337.50 -155.15 182.35 -223.75 -41.40 5. a. 1. 0.5 inches. 0.67 − 0.17 = 0.50 b. 1.14 inches. The departure from average was negative, the actual rainfall needed to be 0.36 inches less than the average rainfall. c. 2.43 inches; 0.86 inches. The departure from the average in June was -0.5 and for July was -0.36, so for those two months it was -0.5 + (-0.36) = -0.86. So it will have to rain 0.86 more inches in August than usual to make that up and the departure from the average will be 0.86. 0.86 + 1.57 = 2.43.
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October 2018
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