How many integers $n$ are there for which $n$ and $n^3+3$ are both prime?
Weekly Problem 30 - 2013
What is the angle $x$ in the star shape shown?
In this article for primary teachers, Lynne McClure outlines what is meant by fluency in the context of number and explains how our selection of NRICH tasks can help.
What is the greatest number of squares you can make by overlapping three squares?
What happens when you round these three-digit numbers to the nearest 100?
Can you spot the mistake in this video? How would you work out the answer to this calculation?
Use the interactivity to investigate what kinds of triangles can be drawn on peg boards with different numbers of pegs.
