Odd One Out

A Maths Starter of The Day

22, 22, 55, 22, 22, 44, 121, 77, 77, 99, 22, 33, 110, 44, 55, 33, 99, 121, 22, 66, 77, 99, 88, 44, 110, 66, 126, 121, 44, 77, 77, 33, 33, 55, 88, 22, 77, 88, 121, 44, 121, 33, 66, 33, 110, 121, 66, 88, 55, 55.


Which number is the odd one out? Write down as many reasons as you can think of explaining why that number is the odd one out.

 

 

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Keywords: Starter | Number Patterns

  • Class 1.6, Brechin High School
  • Thursday, September 02, 2010
  • "This was a good starter. It would make it more challenging if the odd number appeared more than once, although we did have to justify our answers. The 45, 54 was sneaky!"

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Answer

126 is the odd one out. All of the other numbers are multiples of 11

Did you have a different reason?

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Your teacher can decide if you are right or wrong.

Note to teacher: Click the button above to generate a new set of numbers. The numbers are chosen at random so some sets will be more appropriate to your class than others.
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Do you have "Laptops in Lessons"?

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Transum.org/go/?Start=April30

Here's the URL which will take
them to an activity supporting the recognition of multiples.

www.transum.org/go/?to=ff