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Brainteasers

Age 7-9

Jack's stickers

Jack tears off three stickers so that they stay joined edge to edge.

In how many different ways can he do this?

Age 9-13

Dots and lines

The diagram shows a 5 by 5 array of dots.

Without taking your pencil from the paper, join all 25 dots using eight straight lines.

Hint: your lines do not necessarily have to start and end on the dots.

Brainteaser solutions

from page 30

Dots and linesJack's stickers 16 different ways: ACE CEG BDF DFH ABD ABC CDE CDF EFG EFH CDA CDB EFC EFD GHE GHF

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