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Principle Fill in the missing squares with dominoes representing the indicated sum.

Principle Starting with a rectangle, keep cutting out the largest possible squares and see what’s left.

Principle Estimate how many macaroni pieces can fit in one cubic meter.

A sharp sense of observation will be needed to understand the magician’s feats! Will you be able to perform this trick?

Do you think the magician can predict the future? How does he do it? Use your observation skills to find out.

Roll the dice and move around the clock. With just two pieces of information, I’ll find the value of the first die. But how did I do it?

The magician predicts the total that will be obtained. How does she do it?

We can clearly see the magician counting the cards, but how does he find the total of the numbers? He doesn’t know them!

Set up the arithmetic triangle and let the math magic do its work.

Choose any number between 1 and 20, make simple moves on a clock, and I’ll guess the value of your die! How can it always be found?

Pair up cards every time by doing what the magician does in this trick.

No matter the moves made on a 3 by 3 grid, the magician will force you to end up exactly where he wants — without even looking!