In year 2 children are introduced to most of the common metric units, including: centimetres metres kilometres grams kilograms litres. In the real world they will still hear other units being used (those old inches, feet, pounds etc) but it is vital that they gain a secure knowledge of the metric system and are able to judge which units would be most appropriate to use to measure something. These pages ask for things which could be measured using the above units. There are two aspects to this, firstly that children use the correct type of unit (metres to measure length etc) and secondly, that if there is a choice of unit to use the most appropriate ( a classroom in metres rather than kilometres). Go to our 'Which unit? worksheets