Heres the official instructions:ENTRELACS
(THE INTERLACED DESIGN )
Aim : using the ten figure-shaped 5x3x1
pieces and the other six pieces, make a 5x5x5 cube. Secondary aim : using the
ten figure-shaped pieces only, can you complete the following operations :
Addition
Multiplication
ABC
abc
+ DEF
x de
=====
====
GHIJ
fghij
Please
note that no number may have « 0 » as its first digit.