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Pair Sums

Five numbers added together in pairs produce: 0, 2, 4, 4, 6, 8, 9, 11, 13, 15 What are the five numbers?

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Negative Dice

Weekly Problem 16 - 2012
If the odd numbers on two dice are made negative, which of the totals cannot be achieved?

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Minus One Party

Weekly Problem 47 - 2013
What is the value of the given expression?

Weekly Problem 17 - 2008

Stage: 3 and 4 Challenge Level: Challenge Level:1

If p is a positive integer and q is a negative integer, which of the following is the greatest?

A. $p-q$
B. $q-p$
C. $p+q$
D. $-p-q$
E. More information needed
 

If you liked this question, here is an NRICH task which challenges you to use similar mathematical ideas.

 

 

This problem is taken from the UKMT Mathematical Challenges.

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