Weight is how heavy an object is. The three standard forms of weight are grams ( g ), kilograms ( kg ) and tonnes ( T ). Common tools for measuring somethings weight are: scales or neuton scales.
Estimation is an educated guess on something. For example, measuring a table with pencils and the result could be 10 pencils, then measure the pencil on a ruler. Then esimating it can be easier and close to the actual result.
To convert grams into kilograms you divide it by 1000 (÷1000). If you're converting kilograms into tonnes then you divide it by 1000 (÷1000). For example figuring out that a table weighs 500 grams. You then divide 500 by 1000 to convert it into kilograms ( 500÷1000 = 0.5 ). Same go's for converting kilograms into tonnes. ( 0.5 ÷ 1000 = 0.0005 )
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