Write down the error interval for each of the following questions:Name: Date:

**Question 1:**The speed of a car,

*q*, rounded to the nearest whole number is 22km/h. Write down the error interval for

*q*

**Question 2:**The weight of a pencil case,

*g*, rounded to the nearest 100g is 200g. Write down the error interval for

*g*

**Question 3:**The number of daily commuters travelling by train,

*y*, correct to 3 significant figures is 45,200. Write down the error interval for

*y*

**Question 4:**A number,

*c*, rounded to 2 decimal places is 18.56. Write down the error interval for

*c*

**Question 5:**A number,

*u*, rounded to the nearest whole number is 510. Write down the error interval for

*u*

**Question 6:**A number,

*p*,

**truncated**to 1 decimal place is 13.4. Write down the error interval for

*p*

**Question 7:**A number,

*h*, correct to 3 significant figures is 31.9. Write down the error interval for

*h*

**Question 8:**The length of a piece of string,

*r*, rounded to 1 decimal place is 15.5cm. Write down the error interval for the length

*r*

**Question 9:**The density of an alloy,

*w*, correct to 2 significant figures is 8.7g/cm

^{3}. Write down the error interval for

*w*

**Question 10:**The area of a plot of land,

*j*, correct to 1 significant figure is 500m

^{2}. Write down the error interval for

*j*

**Question 11:**A number,

*z*,

**truncated**to 2 decimal places is 14.58. Write down the error interval for

*z*

**Question 12:**The number of passengers on a coach,

*u*, rounded to the nearest 10 is 50 people. Write down the error interval for

*u*

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# Answers

**Question 1:**21.5 ≤

*q*< 22.5

**Question 2:**150 ≤

*g*< 250

**Question 3:**45,150 ≤

*y*< 45,249

**Question 4:**18.555 ≤

*c*< 18.565

**Question 5:**509.5 ≤

*u*< 510.5

**Question 6:**13.4 ≤

*p*< 13.5

**Question 7:**31.85 ≤

*h*< 31.95

**Question 8:**15.45 ≤

*r*< 15.55

**Question 9:**8.65 ≤

*w*< 8.75

**Question 10:**450 ≤

*j*< 550

**Question 11:**14.58 ≤

*z*< 14.59

**Question 12:**45 ≤

*u*< 54

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