IMO, Mass is more difficult than length and volume. One very simple thing we did is to collect different household things (a can of soup, a pack of index cards, a shoe - you get the idea) and stick them on the scale and write the mass in Sharpie.Unome wrote:Does anyone know any good methods for estimating mass?
Then practice. Heft your mass the same way each time (in other words, if you don't rest your hefting elbow on a table today, don't rest it on there tomorrow).