1 Sketch bar models to show how to convert these masses. 5 kg = g 2 1 _ 2 kg = g 4 kg 500 g = g 6.5 kg = g Explain how you can also use what you know about multiplying by 1000 to covert whole kilograms to grams.
2 Solve these problems. Will you need to convert any measurements?
Try to represent problem (b) with bar models. (a) Riana puts another box with a mass of 600 g on the scales. What is the total mass of the two boxes? (b) A bag of compost has a mass of 5 kg. 0.5 kg
is used for planting carrot seeds and another 400 g is used for planting onion seeds. What is the mass of compost left in the bag? (c) The mass of an agouti is 100 times as the mass of a house mouse. The house mouse has a mass of 45 g. What is the mass of the agouti? 3 Create some more problems for a friend to solve. Include examples where kilograms must be converted into grams.
E
Which mass do you think is heaviest? Why? 4 1 _ 2 kg 4 kg 400 g 4 kg
4499 g 4.5 kg
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