Q. Alice goes swimming once every 21 days whilst Bob only go swimming once every 35 days. They both went swimming today. Use prime factors to find the number of days it will be until they both go swimming again on the same day.


Q. Ben changes the ink in his printer every 216 days whereas Jerry has to change the ink in his printer every 188 days because he uses it more. Both Ben and Jerry visited the local computer shop today and bought brand-new cartridges for their printers. Use prime factors to find out the number of days it will be before they both have to revisit the computer shop on the same day.


Q. Use prime factors to find a pair of numbers that have a highest common factor of 12 and a lowest common multiple of 120.


Q. Use prime factors to find a pair of numbers with a highest common factor of 20 and a lowest common multiple of 300



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