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

**Question 1:**The weight of a pencil case,

*y*, rounded to the nearest 100g is 900g. Write down the error interval for

*y*

**Question 2:**The length of a piece of string,

*z*, rounded to 1 decimal place is 41.2cm. Write down the error interval for the length

*z*

**Question 3:**A number,

*r*, rounded to the nearest whole number is 84. Write down the error interval for

*r*

**Question 4:**A number,

*v*, rounded to 2 decimal places is 15.77. Write down the error interval for

*v*

**Question 5:**The weight of a suitcase,

*w*,

**truncated**to 1 decimal place is 7.5kg. Write down the error interval for the weight of the suitcase.

**Question 6:**The density of an alloy,

*n*, correct to 2 significant figures is 3.4g/cm

^{3}. Write down the error interval for

*n*

**Question 7:**The number of daily commuters travelling by train,

*t*, correct to 3 significant figures is 48,900. Write down the error interval for

*t*

**Question 8:**The width of a box,

*e*, rounded to the nearest 10mm is 50mm. Write down the error interval for

*e*

**Question 9:**A number,

*h*, correct to 3 significant figures is 42.8. Write down the error interval for

*h*

**Question 10:**A number,

*p*,

**truncated**to 2 decimal places is 15.76. Write down the error interval for

*p*

**Question 11:**The quantity of water in a bottle,

*e*, rounded to the nearest whole number is 520ml. Write down the error interval for

*e*

**Question 12:**The volume of a box,

*c*, correct to 1 significant figure is 400cm

^{3}. Write down the error interval for

*c*

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# Answers

**Question 1:**850 ≤

*y*< 950

**Question 2:**41.15 ≤

*z*< 41.25

**Question 3:**83.5 ≤

*r*< 84.5

**Question 4:**15.765 ≤

*v*< 15.775

**Question 5:**7.5 ≤

*w*< 7.6

**Question 6:**3.35 ≤

*n*< 3.45

**Question 7:**48,850 ≤

*t*< 48,949

**Question 8:**45 ≤

*y*< 55

**Question 9:**42.75 ≤

*h*< 42.85

**Question 10:**15.76 ≤

*p*< 15.77

**Question 11:**519.5 ≤

*e*< 520.5

**Question 12:**350 ≤

*c*< 450

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