lördag 21 november 2009

Weight - with wrapped milk cartons

Margareta Forsbäck told me how to work with wrapped milk cartons to introduce the concept of weight. Each carton could be filled with anything and was wrapped in neatly. At first the children were to sort the cartons by weight, then guess the weight and then check the weight to finally figure out the difference between hypothesis and results.

I then got an idea to try to balance the cartons on a self-made balance scale. We put the cartons on the balancescale trying to find balance. Two at a time we put them on the scale. We managed to put all the cartons on the scale without losing the balance. We then decided  to remove the cartons, also two at a time and still without losing the balance. It became more difficult but we made it.

Here's what it looked like:

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