Weight is how heavy is the object. The standard forms are g (grams), kg (kilograms). The tools to measure these are scale and balance.
Estimating is a educated guess to the amount of something is. If a person knows the weight of a whiteboard marker is 30g, then they can compare the weights with a balance or scale. If they know how much the weights are. They can make a estimation.
Converting is not easy. If a person wants to convert g (grams) to kg (kilograms) just divide the number by 1000. If someone wants to convert kg (kilograms) to t (tonnes) just divide the number by 1000.
LI: To explore the standard forms of weight.
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