Multiply 28x72 using lattice method.
Write 278 as a product of prime numbers.
Multiply. Use the lattice method. 277*32=
I hope your teacher does not teach this method as a viable method for multiplication.
A week ago Yahoo presented this method as a novelty and as a "math trick".
This website explains and shows diagrams for multiplying using the lattice method.
http://mathforum.org/library/drmath/view/52468.html
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