9. Ms Condron ordered some gadgets for St Olaf’s. She ordered a touchscreen computer weighing 3kg 400g, a new telescope weighing 3kg 60g and a new laptop for the offi ce. If the total weight of the delivery was 9kg 100g, what was the weight of the laptop?


10. Tommy ‘Mé Féin’ Haze, the champion bantamweight boxer, weighed in at 52kg 223g. His opponent, Mark ‘The Kid’ Dooley, weighed in at 49kg 50g. What was the difference in the weight of the two boxers?


Puzzler Anthony had €30 when he went to the shop. He bought:


 1.8kg of Pic ’n’ Mix at €1.15 per 300g  2 kg 500g of marbles at €3.25 per 500g  200g of crisps at €0.67 per 25g.


What change did Anthony receive from his €30?


Multiplying and Dividing Weights


An astronaut’s helmet weighs 1kg 250g. What is the weight of fi ve helmets? There are two ways of working this out.


×


kg g 1 1


6


a) kg g 5 840 4


× 2. Now try these.


a) 3.75kg ×


4


b) 8.21kg ×


5 c) ×


4.87kg 2


d) 5.98kg ×


5


e) 7.94kg ×


3 f) ×


2.45kg 9


Weight 183 250 1. Complete the following.


b) kg g 3 250 7


×


c) kg g 7 790 3


×


d) kg g 4 375 8


×


e) kg g 2 420 9


×


f) kg g 6 550 2


×


250 2 5


×


1.25kg 5


1 2 6.25


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