Get a pair of scales and let the child weigh anything he wishes. Let
him learn to accurately judge a pound, then to estimate the weight
of an article before placing it upon the scales. Teach the child
comparative weights by lifting articles and determining which is the
heavier. Encourage him to make a pair of balances with which he can
balance one object against the other after he has compared them by
holding one in each hand. Many variations can be easily made of these
ideas, to help the child to become accurate in estimating weights. All
practice will be more interesting if there is a record made, and the
spirit of competition is introduced.