# Just One Dice

Today I gave Rocket Boy this problem from the big book of puzzles. On a six-sided dice, the two opposite sides are marked in such a way that the sum of their numbers (or dots) adds up to 7. Given a picture of a dice with three sides visible, figure out what should appear on… Read More Just One Dice

# Lotsa Snowflakes

I was going to do a class for 6-10 year olds today. The plan was to explore symmetry with snowflakes. But nobody signed up and the class got cancelled. Which meant a luxuriously slow Saturday morning spent with the Rocket Boy, his best friend A, A’s little brother, and their mom… cutting snowflakes. The boys… Read More Lotsa Snowflakes

# Fairy Tale Math Circle #7

No photos from this week’s circle. Yep, not a single one. The official photographer, aka the Rocket Dad, is out of town. And I was so excited about the math problems (a mix of insight problems, algebra and knot theory), that I completely forgot to pack the camera. Now, I’ve been trying to figure out… Read More Fairy Tale Math Circle #7

# Fairy Tale Math Circle #4

One of the least logical fairy tales I know is the one called The Little Speckled Hen (Курочка Ряба). In it, a chicken lays a golden egg and her owners take turns trying to crack it. They fail at it and yet a tiny mouse runs by, hits the egg with its tail, the egg… Read More Fairy Tale Math Circle #4

# Transformers – the Math Camp

Every morning this week the Rocket Boy spent an hour online in the Natural Math‘s online summer camp. We love just about everything that comes from Natural Math (yep, that includes the Moebius Noodles book I co-authored some years back and the new one, Avoid Hard Work, that’s coming out in the Fall). But up… Read More Transformers – the Math Camp

# Fairy Tale Math Circle #2

Wait, what happened to the Fairy Tale Math Circle #1? And what is it in the first place? Well, some time ago I came across a wonderful Russian book called “Математические олимпиады в стране сказок” (издательство Белый Город). In it each chapter presents 8-10 math problems themed around one of the most well-known fairy tales.… Read More Fairy Tale Math Circle #2

# Math on a Chess Board

M. C. Escher Sometimes, when we have friends over, Rocket Boy gets out his chess board and his favorite chess set for a friendly game. But the kids don’t always end up playing chess. Instead, they build other, pretty elaborate, games on and around the board. For example, once they played “tea-time in the chess… Read More Math on a Chess Board