Understanding Percentages and Tape Diagrams

The video tutorial covers lesson two, focusing on the formula 'part equals percent times whole.' It provides an overview of different modules, highlighting their difficulty levels. The teacher guides students through exercises to identify the whole in various scenarios and solve problems using the formula. An example problem is solved both algebraically and using a tape diagram, offering a visual approach to understanding the concept.

What is the new formula introduced in this lesson?

• x equals y times k

• part equals percent times whole

• y equals k times x

• whole equals part times percent

In the scenario '15 is what percent of 90', what is the whole?

• 105

• 15

• Unknown

• 90

If 70% of students earned a B, what is the whole?

• All students

• 70

• Unknown

• 70% of students

In the problem '40% of the students on the field trip love the museum', what is the whole?

• 40

• Students who love the museum

• 20

• Total students on the field trip

How do you convert a percentage to a decimal?

• Multiply by 100

• Move the decimal two places to the right

• Divide by 10

• Move the decimal two places to the left

In Ty's math class, 20% of students earned an A. If there are 30 students, how many earned an A?

• 10

• 20

• 6

• 5

What is the purpose of using a tape diagram in problem-solving?

• To check answers

• To avoid using formulas

• To provide a visual model

• To make calculations faster

How many boxes are needed in a tape diagram if 20% is one section?

• 20

• 10

• 5

• 4

If each box in a tape diagram represents 6 students, how many students are represented by 20%?

• 18

• 12

• 6

• 3

What is the total number of students if 5 boxes each represent 6 students in a tape diagram?

• 30

• 35

• 20

• 25