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Challenges

Problems worth getting stuck on

A small shelf of curious problems, gathered for every family here. Pick one, sit down together, and if it bites back, June can work through it with your child.

2 of 21 challenges ·

Grade 4

Add it without adding

Three sums that look like work and are not -- pair the ends, balance the scale, or let the subtractions fold together.

3 problems

Grade 8

No pen, no paper

A shaded rectangle sits in the corner of a right triangle and four measurements are all you get. The trick is seeing the two famous triangles hiding in the drawing.

1 problem