Lattice Multiplication (right) — a Low Stress, Near Error Free, Diagnostic Way to Multiply

A derivative of Napiers Bones and perhaps the first calculator. (See Napiers Bones in Wikipedia.) The easiest of all multiplication algorithms to teach and learn. (The hard part is drawing the lattice.) First, work all of the multiplication facts (in any order). Then add up the columns of numbers generated along the diagonals. Superior to the standard method of multiplication because it separates the multiplication from the addition. Low stress because one can take a break in the middle of a problem and pick up where they left off. Virtually error free if one knows or can figure out the multiplication facts. Diagnostic in that the cells reveal what facts were wrong if the answer is incorrect. Go to MOVE IT Math™ on the web @ moveitmaththesource.com for lessons and teaching aids for Lattice Multiplication and other multiplication algorithms. The site is full of great basic math lessons that are effective with ALL children, including those who dont know what they ought to know by now and those who need enrichment. Please give us a chance to help you boost grades, increase test scores, and improve attitudes. EVERYONE can learn and like math. We are new to the web but have been making that happen for more than 35 years!

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[laughylolly]

Taught this to a class of 11 year olds in a bottom maths set today. Loved it. Known this method from a young age and always found it to be easier than your traditional long multiplication methods.

[mim6425]

@laughylolly Google MOVE IT Math and click on "free e-books" at the top to download Multiplication and Division Made Easy. The book contains templates for lattice mult. and shows how to perform lattice mult. without the lattice. The best, MOVE IT Math™

[traumacenterfan10]

Is there any way of applying this to rational (Q) numbers? you know, like: 12,75 or 546,23205, for example?

[mim6425]

@traumacenterfan10 The only difference between using Lattice Multiplication with decimals is figuring out where to put the decimal point. For that, you use the same rule as for whole numbers: Count the number of digits to the right of the decimal point in both numbers and count in that many digits in the product for the decimal point. For x the numbers in your example, you would need a lattice 4 columns wide and 8 rows long.

[ArtistryofDebauchery]

lol this is much more complicated than the contemporary version

[mim6425]

@ArtistryofDebauchery In other words, it isn't the way you learned to multiply.

[footballforcildren12]

to long7

[Bethlovestoontown]

@breyerlvrsunited im in 5th grade too

[Bethlovestoontown]

OMG! thank you so much! now i know how to do lattice again! ^_^

[iluvtoliveforjoy]

Noo wait I kept watching it then stopping it, and now I actually get it! Yaaay! xD

[iluvtoliveforjoy]

@breyerlvrsunited I wish I did :(

[iluvtoliveforjoy]

you talk too fast D:

[breyerlvrsunited]

Thanks. I have to do lattice in my homework in 5th grade and I get it now :D

[LuisVasDeCamoes]

isto parece complicado

parece muito mais facil calcular sem truques