El sistema métrico decimal y el sistema imperial de medidas

Hay cosas (magnitudes) que pueden medirse y otras que no. Para aquellas que pueden medirse es necesario usar una unidad de medida.

There are two systems of measurement currently in use in Britain: the imperial system and the metric system.

The imperial system is based on traditional units of measurement, many of which were first introduced several hundred years ago. It is gradually being replaced by the metric system, which is used throughout Europe and in many other parts of the world.

The main disadvantage of the imperial system is that it has a lot of awkward conversions, such as 12 inches = 1 foot. The metric system has the advantage that it is based on powers of 10, namely 10, 100, 1000 and so on, so it is much easier to use when you do calculations.

Here you are some estimations: [1]

Choose an appropriate unit for each of the following:
1. Your own height.
2. The thickness of your Math book.
3. The distance from home to school.
4. Your own weight.
5. The weight of a coin.
6. The weight of a bus.
7. A large bottle of lemonade.
8. A dose of medicine.
9. A bottle of wine.
10. The height of your classroom.
11. The distance from Granada to Barcelona.
12. The thickness of your little finger.
13. The weight of your Maths book.
14. The amount of water in a fish tank.
15. The weight of water in a fish tank.
16. The weight of an aircraft.
17. A spoonful of medicine.
18. The amount of wine in a standard bottle.
19. The length of a football pitch.
20. The weight of your teacher's head.
21. The amount of water in a bath.
22. The weight of a mouse.
23. The amount of tea in a teapot.
24. The thickness of a piece of wire.
Estimate the approximate metric length, weight or capacity of each of the following.
1. Your Maths book (both length and weight).
2. The length of your school hall.
3. The capacity of a milk bottle.
4. A brick (length, width and weight).
5. The diameter of a 10p coin, and its weight.
6. The distance from your school to Madrid.
7. The weight of a cat.
8. The amount of water in one raindrop.
9. The dimensions of the room you are in.
10. Your own height and weight.

Now clic on one of the following links:

Links

[1] Based in "GCSE Maths 2 tier-foundation for AQA A".

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