Question

Sean is choosing what size gloves to order from an online store. He estimates that his hand is 20 centimeters long. When he measures with a ruler, however, he finds that his hand is actually 18 centimeters long. What is the percent error for his estimate?

Answer 1

Answer:

10%

Step-by-step explanation:

Sean first thought that his hand was 20 cm so:

20cm

When he measures with a ruler, he gets 18 cm so:

18cm

The equation is really simple, and you basically do:

20/20 - 18/20 = 2/20 = 1/10 = 10%

The equation is:

1- x/y

x equals the new number

y equals the original number