Add neighboring numbers: why the result is always odd?
Add three neighboring numbers: what it is divisible by?
What about four neighboring numbers?
Pascal triangle mod 2
Post-it puzzle: Alice, Bob and Claire see the others' numbers, not theirs. Alice sees 3, Bob 3, Claire 2. What numbers each has?
Same with kids
Hedgehog wants to bring an apple to the porcupine, and return back
SET
Disentangle
Add three neighboring numbers: what it is divisible by?
What about four neighboring numbers?
Pascal triangle mod 2
Post-it puzzle: Alice, Bob and Claire see the others' numbers, not theirs. Alice sees 3, Bob 3, Claire 2. What numbers each has?
Same with kids
Hedgehog wants to bring an apple to the porcupine, and return back
SET
Disentangle
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