Choosing a scale Session 2 Length = 2m (200 cm) Width=1.5 m (150 cm)

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Presentation transcript:

Choosing a scale Session 2 Length = 2m (200 cm) Width=1.5 m (150 cm)

1 unit on the drawing represents Scale 1:20 1 unit on the drawing represents 20 units in real life.

Scale 1:20 10cm 7.5 cm Real life Length = 2m (200 cm) Width=1.5 m (150 cm) Real life To draw this on the paper divide the real length of the bed by 20. 200/20= 10, so the drawing of my bed should have a length of 10 cm on the paper. Length = 10 cm (200/20) Width= 7.5 cm (150/20) Drawing 10cm 7.5 cm Scale 1:20

Real life L= 1m W=0.5m A book shelf is 1m long and 0.5 m wide. 1- Make a scale drawing of it 2- Work out the measurements for the scale drawing. 1- (Consider a scale of 1:20) Real life L= 1m W=0.5m

From big to small multiply From small to big divide

From m to cm: times by 100 From cm to m: divide by 100 Actual size in From big to small multiply From small to big divide 1.3m 0.5 m 3.2m 1.8m From m to cm: times by 100 From cm to m: divide by 100 1.2m 3.5m Actual size in Size on plan in cm m cm Scale: 1:50 I need to divide by 50 3 300 300 ÷ 50=6 1.3 130 130 ÷50= 2.6 1.8 180 180 ÷ 50 = 3.6 1.2 0.5 3.5 × 100 Scale 1:50 120 120÷50 50 50÷50=1

Real life measurements in mm Real life measurements in cm Furniture item Real life measurements in mm Real life measurements in cm Divide by 10 Real life measurements in m Divide by 100 Single bed L=2200 W= 1200 L= 220 W=120 L=220÷100=2.2 W=120÷100=1.2 Corner table L=300 W=300 L=30 W=30 L=30÷100=0.3m W=0.3m Bookcase L=500 L=50 L= 0.5 W=0.3 Chest of drawers L=1200 W=500 L=120 W=50 L= W= Beside table L=400 L=40 Desk W=600 W=60 From big to small multiply From small to big divide 1m=100cm 1cm= 10mm 1m= 1000mm

Real life measurements in cm Divide measurement by 20 (scale 1:20) Furniture item Real life measurements in cm Divide by 10 Divide measurement by 20 (scale 1:20) Single bed L= 220 W=120 L=220÷20=11 cm W=120÷20=6 cm Corner table L=30 W=30 L=30÷20=1.5 W=30÷20=1.5 Bookcase L=50 L= 2.5 W=1.5 Chest of drawers L=120 W=50 L=6 W=2.5 Beside table L=40 L=2 Desk W=60 W=3

Single bed L= 220 W=120 L=220÷20=11 cm W=120÷20=6 cm My single bed should have: L= 11cm W= 6cm W= 6cm L= 11cm

Corner table L=30 W=30 L=30÷20=1.5 W=30÷20=1.5 L= 1.5 cm W= 1.5 cm