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7th Math 4.9

Last updated over 2 years ago

6 questions

IP

1

1

1

1

1

ET

4

Question 1

1.

Puppy--The vet weighed Patty's puppy on a broken scale. The scale said her puppy weighed 34.5 pounds even though Patty knows that her puppy's real weight is 30 pounds.

What was the percent error of the scale? Is this an accurate estimate?

"The percent error of the scale was..."
"This (is / is not) an accurate estimate because..."

Symbol for absolute value (shift + \ ): | |

CFS:
#1: Accurately identifies approximate and exact values
#2: Accurately calculates percent error with formula

Question 2

2.

Chem--Ms. Pool the mad scientist is mixing chemicals for her lab experiment. The experiment required 15 milliliters of sodium, but she only used 12 milliliters.

What was the percent error?

"Ms. Pool's percent error was..."

Symbol for absolute value (shift + \ ): | |

CFS:
#1: Accurately identifies approximate and exact values
#2: Accurately calculates percent error with formula

Question 3

3.

Tick Takis--In a new trend, people have to guess how many chips are in a bag and then count how many there really are.

Chris guessed that there are 52 Takis in his bag, but after he counted, he found that there were actually only 32 chips. What was his percent error?

61.5%

162.5%

62.5%

38.5%

Question 4

4.

Concert--The famous singer Moono Bars had a concert at the SAP Center last year. Katheryn guessed that 14,425 people attended.
If 14,000 tickets were actually sold, how accurate was Katheryn's guess?

"Katheryn's guess was... because..."

Symbol for absolute value (shift + \ ): | |

CFS:
#1: Accurately identifies approximate and exact values
#2: Accurately calculates percent error with formula

Question 5

5.

VERY SPICY--Try if you have time (optional)

1, 2, 3--Sid used a computer to draw a circle with a radius of 4 units on a grid. He estimated the area of the circle by counting the number of squares that were mostly inside the circle and got an answer of 52 square units.

What was the percent error of Sid's estimation?
(Hint: You have to calculate the exact area of the circle)

CFS:
#1: Accurately identifies approximate and exact values
#2: Accurately calculates percent error with formula

Great job. Keep working on IXL, especially since we have another interim coming up!

Please wait until instructions to start the exit ticket.

Question 6

6.

Guesstimate--Last year, an old lady walking by Prize's campus saw the 5th graders out at recess and guessed that there were 99 students. The correct number of students was 110.

What was the percent error? How accurate was her guess?

"The percent error was..."
"This (is / is not) an accurate estimate because..."

Symbol for absolute value (shift + \ ): | |

CFS:
#1: Accurately identifies approximate and exact values
#2: Accurately calculates percent error with formula