Lesson 15: Practice Problems
Problem 1
To find 40% of 75, Priya calculates
. Does her calculation give the correct value for 40% of 75? Explain or show how you know. If
represents a number, does always represent 40% of that number? Explain your reasoning.
Problem 2
Han spent 75 minutes practicing the piano over the weekend. For each question, explain or show your reasoning.
Priya practiced the violin for 152% as much time as Han practiced the piano. How long did she practice?
Tyler practiced the clarinet for 64% as much time as Han practiced the piano. How long did he practice?
Problem 3
Last Sunday 1,575 people visited the amusement park. 56% of the visitors were adults, 16% were teenagers, and 28% were children ages 12 and under. Find the number of adults, teenagers, and children that visited the park.
Problem 4
Order from greatest to least:
Problem 5 From Unit 3 Lesson 14
Complete each statement.
20% of 60 is
25% of is 6
% of 100 is 14
50% of 90 is
10% of is 7
30% of 70 is
Problem 6 From Unit 3 Lesson 9
A shopper needs 24 sandwich rolls. The store sells identical rolls in 2 differently sized packages. They sell a six-pack for $5.28 and a four-pack for $3.40. Should the shopper buy 4 six-packs or 6 four-packs? Explain your reasoning.
Problem 7 From Unit 2 Lesson 15
On a field trip, there are 3 chaperones for every 20 students. There are 92 people on the trip. Answer these questions. If you get stuck, consider using a tape diagram.
How many chaperones are there?
How many children are there?