Weds June 8th More HCF – LCM and Factor Trees

LEARNING OBJECTIVE: To use HCF, LCM, Prime Numbers in problems and be able to express a number as a product of its prime factors.

SUCCES CRITERIA: You will be able to solve HCF,LCM and Prime number problems and be able to express any number as a product of its prime factors

STARTER:

1. Write down all the prime numbers between 20 and 40
   
2. Which of these numbers are NOT prime numbers? Explain your answers
   
3. Two prime Numbers lie between 80 and 90. Find their sum and their difference
   

LESSON: Prime numbers and factor trees using index notation. LCM using VENN Diagrams

Complete all these questions (or continue if you started them yesterday)

Then complete these questions, Extension Questions

PLENARY:

1. Here are three numbers: 36 42 and 49. Give a reason why each number could be the odd one out.
   
2. Helen is training for a triathlon.
   

She plans to run every 2 days, swim every 4 days and cycle every 5 days. Today she ran swam and cycled.

How many days will it be before she next runs, swims and cycles on the same day?