Question

7th grade math I need some help with this.Match the percent error with its scenario.

Answer 1

Answer:

• 12.5% -- Lenny's bug
• 10% -- Candice's board
• 15% -- Leo's bag
• 20% -- Josie's odometer

Step-by-step explanation:

A percentage error is computed as ...

  percent error = (amount of error)/(correct amount) × 100%

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Leo's bag: 1.5 lbs/(10 lbs) = 15%

Candice's board: 1.2 ft/(12 ft) = 10%

Lenny's bug: 2 cm/(16 cm) = 12.5%

Josie's odometer: 4 mi/(20 mi) = 20%

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There's nothing magical about percentages. They're just another way to write a number, usually a fraction. You can think of "percent" (%) as another way to write "divided by 100" or "hundredths" (/100). (In similar fashion, the symbol ‰ means /1000.)

  1.5/10 = 15/100 = 15% . . . . fifteen hundredths is fifteen percent

  1.5/10 = 0.15 = 15% . . . . . . fifteen hundredths is fifteen percent

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100% = 100/100 = 1, one full amount. A lot of times you will hear or see "multiply by 100 to change it to a percent." That is not true. Multiplying a number by 100 makes it be 100 times as big. When changing a number to a percent, you want it to keep its same value. That is why I show the fraction being multiplied by 100%. It is multiplication by 1, so the value stays the same.