Complete the diagram!
When each diagram below is complete the number in the middle of each group of 3 adjoining cells is the average of its two neighbours. Fill in the missing numbers.
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The average of 5 and 9 is 7 so the first gap is a 7. Next we need to find the number that when having an average with seven creates a 9. This is 11 because it is 2 above 9 and 7 is 2 below 9. If we do this again with different numbers, we get the average as 13.
ReplyDeleteNow we have our answer:
5 7 9 11 13