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Sums and Differences 1

Age 7 to 11
Challenge Level
Begin by finding the sum and difference of the numbers you have chosen.
Then think carefully about other pairs of numbers with the same sum. Can you find a pair which also has the same difference?

It might be helpful to record your findings in a table like this:

1st number 2nd number Sum Same? Difference Same?
24 31 55   7  
15 40 55 Yes 25 No, too high