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# Reasoning with even and odd numbers 9/12/2011 - PowerPoint PPT Presentation

Reasoning with even and odd numbers 9/12/2011. Task:. In groups you will creating a poster about one way to reason with even and odd numbers. You will receive a fact sheet to review, and summarize it using words, diagrams, models etc. to explain it.

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## PowerPoint Slideshow about 'Reasoning with even and odd numbers 9/12/2011' - nira

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### Reasoning with even and odd numbers9/12/2011

• In groups you will creating a poster about one way to reason with even and odd numbers.

• You will receive a fact sheet to review, and summarize it using words, diagrams, models etc. to explain it.

• These will be presented to the class, and will help them understand some basic rules we can follow to reason with even and odd numbers.

• The sum of two even numbers is even!

• Example: 2+2=4

• 24+12=36

• 6+8=14

• Made from an even number plus one. So when you ad two odd numbers you get the sum of two even numbers.

• Example: 5= 4+1 and 3=2+1

• So 5+3= 4+1+2+1

• +4+2+1+1

• =8

• For multiplication:

• Odd times odd = odd

• Even times odd=even

• Without doing the actual addition/multiplication, are the following sums odd or even?

• 203+512

• 934+116

• 199+0

• 59 x 45

• 120 x 56

• 59 x 0