Geometry and Measures Upper and Lower Bounds Grade 5.

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Presentation transcript:

Geometry and Measures Upper and Lower Bounds Grade 5

Complete the rounding table: Task on Entry - Rounding 1 dp2 dp1 sf2 sf

The length of a piece of string has been rounded to 7cm. What is the shortest and longest it could have been before rounding? 7cm6cm8cm 6.5cm7.5cm Upper and Lower Bounds

The width of a football pitch is 76.2 yards, to one decimal place. What is the widest and narrowest the pitch could be? 76.2 yards76.1 yards76.3 yards yards76.25 yards Upper and Lower Bounds

A roof tile weighs 54.23g, correct to 2 decimal places. What is the minimum possible weight of 30 tiles? 54.23g54.22g54.24g g54.235g Upper and Lower Bounds x 30 = g = 1.6kg (1dp)

A postcard measures 8cm by 6cm, to the nearest whole centimetre. What is: a) Its smallest possible area? b) Its biggest possible area? 8cm 6cm Applying Upper and Lower Bounds

A postcard measures 8cm by 6cm, to the nearest whole centimetre. What is: a) Its smallest possible area? = 7.5cm x 5.5cm = 41.25cm² (2dp) 8cm 6cm Upper and Lower Bounds

A postcard measures 8cm by 6cm, to the nearest whole centimetre. What is: b) Its biggest possible area? = 8.5cm x 6.5cm = 55.25cm²(2dp) 8cm 6cm Upper and Lower Bounds

Independent Task

Further Bounds 1.84cm 2.25cm

Further Bounds Work out the maximum and minimum dimensions of the shape…

Further Bounds Using these dimensions, work out the maximum and minimum values for the area

Further Bounds Calculating the maximum possible error…

Further Bounds Calculating the maximum possible error…

Independent Task

Further Bounds Calculate the maximum and minimum dimensions

Further Bounds Calculate all the possible volumes

Further Bounds Calculate the maximum possible error…

Stretch and Challenge