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Course: Class 6 (Old) > Unit 3

Lesson 9: Some problems on HCF and LCM
Math
Class 6 (Old)
Playing with numbers
Some problems on HCF and LCM
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GCF & LCM word problems

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Problem

Ronald and Tim both did their laundry today. Ronald does laundry every 6 days and Tim does laundry every 9 days.
How many days will it be until Ronald and Tim both do laundry on the same day again?
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0.75
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
days