Transcript Slide 1

Created by Rina Iati, South Western School
Distroct, Hanover, PA
Created by Rina Iati, South Western School
Distroct, Hanover, PA
1. Create a grid. Write one
factor along the top, one
digit per cell.
Write the other factor
along the outer right side,
one digit per cell.
2. Draw diagonals
across the cells.
3.Multiply each digit
in the top factor by
each digit in the side
factor. Record each
answer in its own
cell, placing the tens
digit in the upper half
of the cell and the
ones digit in the
bottom half of the
cell.
4. Add along each
diagonal and record
any regroupings in the
next diagonal
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Created by Rina Iati, South Western School
Distroct, Hanover, PA
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Created by Rina Iati, South Western School
Distroct, Hanover, PA
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Created by Rina Iati, South Western School
Distroct, Hanover, PA
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The lattice algorithm for multiplication has been traced to
India, where it was in use before A.D.1100.
Many Everyday Mathematics students find this particular
multiplication algorithm to be one of their favorites. It
helps them keep track of all the partial products without
having to write extra zeros – and it helps them practice
their multiplication facts
Created by Rina Iati, South Western School
Distroct, Hanover, PA