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Monday, 5 September 2011

This week we are using our doubles knowledge

We can find answers to problems like 7+8 by using double 7 and 1 more. We know double 7 is 14 and one more is 15 so 7 + 8 = 15
we know...
Double 2 is 4        Double  3 is 6
 Double 4 is 8         Double 5 is 10 
Double 6 is 12       Double 7 is 14
 Double 8 is 16       Double 9 is 18

This makes adding numbers to 20 easy.

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