Longitud
- Dibuja en tu libreta la “escalera” de la longitud, con las instrucciones que te dará el profesor.
- Expresa las medidas en la unidad que se indica:
- 7,34 km en metros =
- 0,125 m en centímetros =
- 25 670 mm en metros =
- Change:
- 732 cm to metres.
- 410 mm to centimetres.
- 840 mm to metres.
- 1.2 metres to centimetres.
- 0.72 cm to milimetres.
- 3 m to milimetres.
- Fill the gaps:
- 125 cm = … m; 82 mm = … cm; 550 mm = … m; 2100 m = … km;
- 208 cm = … m; 1240 mm = … m; 34 km = … m; 3.4 m = … mm;
- 13.5 cm = … mm; 0.67 m = … cm; 7.03 km = … m; 0.72 cm = … mm;
- 0.25 m = … cm; 0.64 km = … m; 3 km = ... m; 0,75 km = ... m
- El diámetro de un glóbulo rojo es de 6 μ (micras). ¿Cuántos glóbulos rojos habría que juntar para hacer una fila de 1 pulgada de largo?
- Expresa en la unidad más adecuada la longitud de uno de tus pasos normales.
- Expresa en milímetros, centímetros y metros tu estatura:
- Yo mido ............ milímetros.
- Yo mido ............ centímetros.
- Yo mido ............ metros.
- Magazines are stored in piles of 100. Each magazine is 4 mm thick. Calculate the height of one pile of magazines. Give your answer in centimetres.
- Look at these pictures:
- The wall has nine layers of bricks. Each brick is 7.5 cm high. Each layer of mortar is 13 mm thick.
- Calculate the height of the wall, in centimetres.
- The wall is to be continued until it is at least 1 metre high. What is the smallest number of extra layers of bricks needed?
Imperial system equivalences
Imperial system equivalences
- 12 inches = 1 foot
- 3 feet = 1 yard
- 1760 yards = 1 mile
Examples of the everyday use of imperial measures are:
- miles for distances by road
- feet and inches for people’s heights
- the altitude of a plane in flight
- Fill the gaps:
- 2 feet = … inches
- 4 yards = … feet
- 2 miles = … yards
- 4 feet = … inches
- 1 yard = … inches
- 10 yards = … feet
- 60 inches = … feet
- 36 feet = … yards
- 8800 yards = … miles
- 1 mile = … feet
- 96 inches = … feet
- 15 feet = … yards
- 1 mile = … inches
- 15 840 feet = … miles
Conversion factors
Conversion factors
You need to know the approximate conversions between certain imperial units and metric units.
The symbol ‘≈’ means ‘is approximately equal to’.
- 1 inch ≈ 2.5 centimetres (trick: double plus a half). Actually, 1 inch = 2.54 cm
- 1 foot ≈ 30 centimetres (trick: times three and add a zero). Actually 1 foot = 30.48 cm
- 1 mile ≈ 1.6 kilometres (trick: one plus a half plus one tenth). Actually 1 mile =1.609344 km
- 5 miles ≈ 8 kilometres. Actually 5 miles = 8.04672 km.
- Use the conversion factors above to find the following approximations. Note: An answer should be rounded when it has several decimal places, since it is only an approximation.
- 8 inches = … cm
- 30 miles = … km
- 30 cm = … inches
- 80 km = … miles
- 100 miles = … km
- 1 km = … yards
- 1 foot = … cm
- 1 yard = … cm
- Which is longer, a metre or a yard? Show your working clearly.
- Two villages are 40 km apart.
- Change 40 km into metres.
- How many miles are the same as 40 km?
- Susan is driving through a French town. The speed limit in the French town is 50 kilometres per hour. Her speed is 35 miles per hour. Is she breaking the speed limit?
- Calculate the percentage error we make when we use the estimations above.
Links
Links