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# 7th math c2 -l81

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### 7th math c2 -l81

1. 1. lesson 81.notebook April 22, 2014 Assignment: 1-->Set 81 (odds) - Due Tomorrow [4/23] 2-->Test #12 - Friday [4/25]
2. 2. lesson 81.notebook April 22, 2014 Lesson 81 WarmUp: 1) 10 lb 6 oz - 7 lb 11 oz 2) 600 is 5/9 of what number? 3) What number is 4% of 400? 4) Tina mowed lawns for 4 hours and earned \$7.00 per hour. Then she weeded flower beds for 3 hours and earned \$6.30 per hour. What was her average hourly rate for the 7 hours? 5) Write 30 x 106 in scientific notation.
3. 3. lesson 81.notebook April 22, 2014 Lesson 81: *We can use ratio boxes to solve percent problems, too. P A D DN T
4. 4. lesson 81.notebook April 22, 2014 Lesson 81 Examples: A) Twenty-one of the 70 acres were planted with alfalfa. What percent of the acres were not planted in alfalfa? P A
5. 5. lesson 81.notebook April 22, 2014 P A B) Lucy still has 60% of the book to read. If she has read 120 pages, how many pages does she still have to read?
6. 6. lesson 81.notebook April 22, 2014 C) David missed four of the 30 problems on the homework. What percent of the problems did he answer correctly? P A
7. 7. lesson 81.notebook April 22, 2014 D) 20% of the 4000 students were sick. How many students were not sick? P A
8. 8. lesson 81.notebook April 22, 2014 P A E) In the 8th grade, 21 of the 25 students liked chocolate candy. What percent of the students didn't like chocolate?