Both children have been learning about metrics in their math books. As with everything at this age, I'm not aiming for creating experts in the subject, but a broad understanding of the concept, and - more importantly - a love of math! We've come up with (quite accidentally, really) fun ways to reinforce what they are learning about the metric system. I want them to understand the units of liters, grams, and meter and how to convert them accordingly. 1. Measure LEGO creation...