The boys have been using cm and m to measure different items. They have found accuracy quite a challenge!
If you get chance to practise using a ruler or tape measure that would be great.
Below is a game that will help. Please only do the “measuring length” section as we haven’t covered the other activities yet.
http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/measures/index.htm