I came across trump cards (free to download from JCB)

http://www.jcbexplore.com/downloads/pdf/jcb-trump-cards.pdf

and thought they would be good to use with construction / motor classes. The cards could be used to order the lengths / weight / speed etc., or find the range. For a subset of the cards the mean, median, mode could be calculated. Weights could be converted to tonnes, lengths from cm to metres etc. There is lots of number work or measurements that the cards can be used to cover. The measurements could be rounded to the nearest ten, hundred etc. You could even just play with the cards!!