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A Square Deal

Complete the magic square using the numbers 1 to 25 once each. Each row, column and diagonal adds up to 65.

Cubes Within Cubes

Stage: 2 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

What is the cube root of 1000?  How does this help you?
What size cubes are possible if the maximum number of cubes in one colour is 1000?