7.21.4-Refine Solving Percent Change/Error

​If I wanted to find the difference between two points on this number line, What operation could I use?



If we started the year with 20 students in our class, but two students moved to another school, how many students are remaining? How many are left in our classroom?



What fraction of students represents the REMAINING STUDENTS?



What fraction represents the students who left the school?



What fraction represents the total class at the beginning of the year?

​-5 -4 -3 -2 -1 0 1 2 3 4 5

Multiple Choice

Is it an increase or decrease?
12 inches to 36 inches

• Increase
• Decrease

Multiple Choice

Calculate the percent increase. Round to the nearest percent.

Original: 45

New: 92

• 51%

• 1.04%

• 104%

• .51

Multiple Choice

Calculate the percent increase. Round to the nearest percent.

Original: 74

New: 85

• 0.15%

• 0.13%

• 13%

• 15%

Multiple Choice

What is the correct Percent Change equation?

Percent of change = _____

• $$\frac{original\ amount}{amount\ of\ change}$$  

• $$\frac{percent\ change}{original\ amount}$$  

• $$\frac{amount\ of\ change}{original\ amount}$$  

• $$\frac{original\ amount}{percent\ of\ change}$$  

Multiple Choice

If you have a percent increase problem, your original amount gets...

• bigger

• smaller

Multiple Choice

Find the percent change.
Original amount:  16
New amount: 11

• 5%
• 31%
• .3%
• 56%