Percent Error

​Percent Error

By Victoria Krentz

Open Ended

I used to have 5 cats. Now I have 9 cats. What is the percent of increase?

Multiple Choice

What is the percent of decrease from 34 to 0?

• decrease of 100%

• decrease of 50%

• decrease of 75%

• decrease of 90%

Percent Error Formula

ALWAYS POSITIVE ANSWERS!

Multiple Choice

A student estimated a mass to be 250g. Upon carefully measuring it, the student found out that the mass was actually 240g. What is the estimated value?

• 250g
• 245g
• 230g
• 260g

Multiple Choice

A student estimated a mass to be 250g. Upon carefully measuring it, the student found out that the mass was actually 240g. What is the actual value?

• 230g
• 245g
• 250g
• 240g

Open Ended

Ms. Krentz estimated that 20 students would be present during her 4th period class today. There were actually 22 students present. What is the percent error?

Open Ended

When Quincy saw the length of the line at the department store's cash register, he predicted he'd have to wait 15 minutes. He actually waited only 10 minutes. What is the percent error for Quincy's prediction?

Open Ended

Before football tryouts, Leon predicted he could throw a football 24 yards. During tryouts, he was able to throw a football 30 yards. What is the percent error for his prediction?

Open Ended

Audrey has been practicing her basketball free throws. She predicts to her friends that she will make 15 free throws before she misses one, but she actually makes 20 free throws before missing. What is the percent error for Audrey's prediction?

Open Ended

Harold ran in a 1-mile race. He estimated his average running speed to be 10 miles per hour, but it was actually 9.9 miles per hour. What is the percent error for his estimate?

Open Ended

Carmen participated in a walkathon to raise money for the local library. Before the hour-long event began, Carmen estimated that she would walk 3.5 miles, but she ended up walking 4 miles. What is the percent error for Carmen's estimate?

Open Ended

Tanner heard that the movie streaming service he subscribed to would be raising its rates. He guessed it would only go up $1.50

per month, but the actual increase was $2.50

per month. What is the percent error for his guess?