Introduction Jan 2006 ©RSH.

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Presentation transcript:

Introduction Jan 2006 ©RSH

Discrete Measurements Number of people Shoe size Money Jan 2006 ©RSH

There were an estimated 90 trolls in the field, to the nearest 10. What was the lowest possible number of trolls ? What was the highest possible number of trolls ? Jan 2006 ©RSH

This pile of coins is worth £10 to the nearest £1. What is the lowest possible value of the coins ? What is the highest possible value of the coins ? Jan 2006 ©RSH

Continuous Measurements Height Weight Temperature Jan 2006 ©RSH

Measuring the length of a floor tile to the nearest cm Jan 2006 ©RSH

Measuring the length of a floor tile to the nearest cm Jan 2006 ©RSH

Measuring the length of a floor tile to the nearest cm Jan 2006 ©RSH

Jan 2006 ©RSH

GCSE Questions Jan 2006 ©RSH

Q1 a) Least value of the length = Least value of the width = A rectangular piece of cardboard measures 14 cm by 9 cm, each measurement being correct to the nearest cm. Q1 9 cm Write down the least possible values of the length and the width of the rectangle. [1] Write down the greatest possible values of the length and the width of the rectangle. [1] 14 cm a) Least value of the length = Least value of the width = 14 – 0.5 = 13.5 cm 9 – 0.5 = 8.5 cm b) Greatest value of the length = Greatest value of the width = 14 + 0.5 = 14.5 cm 9 + 0.5 = 9.5 cm Jan 2006 ©RSH

Q1 c) Least perimeter = Greatest perimeter = Write down the least and greatest possible values of the perimeter of the rectangle. [2] Write down the least and greatest possible values of the area of the rectangle. [2] Least 8.5 cm Greatest 9.5 cm Least 13.5 cm Greatest 14.5 cm c) Least perimeter = Greatest perimeter = 8.5 + 8.5 + 13.5 + 13.5 = 44 cm 9.5 + 9.5 + 14.5 + 14.5 = 48 cm d) Least area = Greatest area = 8.5 x 13.5 = 114.75 cm² 9.5 x 14.5 = 137.75 cm² Jan 2006 ©RSH

Q1 e) Least length = Greatest length = 4 x 13.5 = 54 cm Four of these pieces of cardboard are placed, in a row, with their shorter sides joined. Calculate the least and greatest possible values of the length of the four pieces of cardboard. [3] Least 8.5 cm Greatest 9.5 cm Least 13.5 cm Greatest 14.5 cm e) Least length = Greatest length = 4 x 13.5 = 54 cm 4 x 14.5 = 56 cm Jan 2006 ©RSH

Q1 f) Least length of AB = Greatest length of AB = 13.5 – 9.5 = 4 cm Two pieces of cardboard are placed as shown in the diagram. Calculate the least and greatest possible values of the length of the AB. [3] Least length 13.5 cm Greatest length 14.5 cm A B Least width 8.5 cm Greatest width 9.5 cm f) Least length of AB = Greatest length of AB = 13.5 – 9.5 = 4 cm 14.5 – 8.5 = 6 cm Jan 2006 ©RSH

A rectangular piece of cardboard have lengths of 28 cm and widths of 16 cm, each measurement being correct to the nearest cm. Q2 16 cm 28 cm Write down the least possible values of the length and the width of the rectangle. [1] Four of these pieces of cardboard are placed in a row, with their shorter sides joined. Calculate the least and greatest possible values of the length of the four pieces of cardboard[3] Two pieces of cardboard are placed as shown in the diagram. Calculate the least and greatest possible values of the length AB. [3] Least length = 27.5 cm, Least width = 15.5 cm Least = 4 x 27.5 = 110 cm, Greatest = 4 x 28.5 = 114 cm A B Least = 27.5 – 16.5 = 11 cm, Greatest = 28.5 – 15.5 = 13 cm Jan 2006 ©RSH

The length of a desk is measured as 180 cm, correct to the nearest cm. Q3 Write down the least and greatest values of the length of the desk. [2] Three of these desks are laid end to end along their lengths. What is the least value that the total length of the three desks can be ? [1] The distance between two walls is measured as 3 metres correct to the nearest centimetre. Write down, in centimetres, the least and greatest values of the distance between the two walls. [1] Least length = 179.5 cm, Greatest length = 180.5 cm Least = 3 x 179.5 = 538.5 cm Least = 299.5 cm, Greatest = 300.5 cm Jan 2006 ©RSH

Q3 One desk is placed lengthwise between two walls and in contact with the left hand wall, as shown in the diagram. What is the greatest possible length of the gap between the desk and the right hand wall? [2] Greatest distance = 300.5 cm Least length = 179.5 cm desk Wall Wall Gap Floor Greatest gap =300.5 – 179.5 = 121 cm Jan 2006 ©RSH

A lump pf plasticine has a mass of 500 g, correct to the nearest 10 g A lump pf plasticine has a mass of 500 g, correct to the nearest 10 g. A piece of the plasticine is removed and found to have a mass of 310 g, correct to the nearest 10 g. Find the greatest possible value of the mass of the remaining lump of plasticine. [2] Q4 Preparation Least mass of original lump of plasticine = 500 – 5 = 495 g Greatest mass of original lump of plasticine = 500 + 5 = 505 g Least mass of removed lump of plasticine = 310 – 5 = 305 g Greatest mass of removed lump of plasticine = 310 + 5 = 315 g Greatest remaining mass = 505 – 305 = 200 g Jan 2006 ©RSH

A rectangle’s measurements are given as 30 cm by 20 cm, correct to the nearest cm. Find the least possible length of the perimeter of the rectangle. [2] Q5 Preparation Minimum dimensions are 29.5 cm by 19.5 cm Least perimeter = 2 x (29.5 + 19.5) = 98 cm Jan 2006 ©RSH

GCSE Questions The End Jan 2006 ©RSH