LCM

• Find the LCM of 12 and 18?

  36
• Find the LCM of 24 and 36?

  72
• Find the LCM of 60 and 24?

  120
• Two lights flash at the same time. One flashes every 12 seconds and the other flashes every 16 seconds. After how long will they both flash again at the same time?

  After 48 seconds
• Pens come in packs of 8 and pencils come in packs of 20. If we want to buy the same amount of pens as pencils, how many packs of each do we need to buy?


  5 packs of pens and 2 packs of pencils
• Work out the question below?

  In one hour, all three alarms will go off 11 times