Mass is a fundamental property of matter that indicates how heavy an object is. In everyday measurements, we use grams (g) and kilograms (kg) to quantify mass.
Example 1: Kemi and Mariella's Bags of Sweets
Kemi and Mariella both bought a bag of sweets. Kemi’s bag weighed 1300 g and Mariella’s bag had a mass of 1 kg and 500 g. Who had the heavier bag?
Kemi's bag weighed 1300 grams, which is equivalent to 1 kilogram and 300 grams.
Mariella's bag had a mass of 1 kilogram and 500 grams.
To compare the weights accurately:
Mariella's bag was heavier, as 1300 grams is less than 1 kilogram 500 grams.
Example 2: Doughnuts vs. Fruit
Look carefully at the measurements shown on the scales.
The weight of the doughnuts is 500 grams, while the fruit weighs 5 kilograms. To compare their weights, it's important to convert them into the same units. Let's convert both weights to grams for easier comparison.
The doughnuts are already in grams, so no conversion is needed for them. For the fruit, which is 5 kilograms, we convert kilograms to grams knowing that 1 kilogram equals 1000 grams:
5 kg = 5000 g
Now that both weights are in grams, we can compare them directly: 5000 grams versus 500 grams.
5000 grams is greater than 500 grams.
Therefore, the fruit is heavier than the doughnuts.
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