Window Box Multiplication
- Window Box Multiplication
Window Box Multiplication is an alternative method for performing long multiplication. Instead of multiplying numbers within a messy column layout, the equation is performed in a simplified grid like layout. You start off by drawing a rectangle and dividing it into the number of rows and columns required (The example application performs a simple 2 digit by 3 digit equation).
[http://www.davidmgilbert.com/images/wbme/wbme1.png] Once you have divided the rectangle into the desired number of rows and columns, you then diagonally divide the squares into triangles as per the image below.
[http://www.davidmgilbert.com/images/wbme/wbme2.png] Now you need to add your numbers to the outside of the rectangle to the left and underneath. In this example, we are going to multiply 36 x 742.
[http://www.davidmgilbert.com/images/wbme/wbme3.png] Now we need to start performing some math. Multiply the number in each column by the number in the corresponding row. Place the answer as follows, tens in the top triangle of the box, units in the bottom. In the following image, you see we have multiplied 2 x 6 (12) and placed the 1 in the top triangle and the 2 in the lower triangle. Note: If the two digits being multiplied do not equal more than 10, you can leave the upper triangle blank.
[http://www.davidmgilbert.com/images/wbme/wbme4.png] Once all of the triangles are filled you can now add the numbers in the diagonal rows together and place the answer to the right and top of the triangle. Note: If the diagonal row equals more than 10, you simply place a carry-over of the tens amount (demonstrated below as a red 1).
[http://www.davidmgilbert.com/images/wbme/wbme5.png] Once all diagonal rows have been added you can now from the top left of the rectangle around to the bottom right of the rectangle read the answer. (36 x 742 = 26,712).
[ [http://www.davidmgilbert.com/ssCMS.php?page=wbme David M Gilbert - wbme ] ] DavidMGilbert.com - Window Box Multiplication
References
Wikimedia Foundation.
2010.
Look at other dictionaries:
Public-key cryptography — In an asymmetric key encryption scheme, anyone can encrypt messages using the public key, but only the holder of the paired private key can decrypt. Security depends on the secrecy of that private key … Wikipedia
computer — computerlike, adj. /keuhm pyooh teuhr/, n. 1. Also called processor. an electronic device designed to accept data, perform prescribed mathematical and logical operations at high speed, and display the results of these operations. Cf. analog… … Universalium
Wikipedia:Manual of Style — This guideline is a part of the English Wikipedia s Manual of Style. Use common sense in applying it; it will have occasional exceptions. Please ensure that any edits to this page reflect consensus. Shortcuts … Wikipedia
Slide rule — For other uses, see Slide rule (disambiguation). A typical ten inch student slide rule (Pickett N902 T simplex trig). The slide rule, also known colloquially as a slipstick,[1] is a mechanical analog computer. The slide rule is used primarily for … Wikipedia
Wikipedia:Manual of Style/Mathematics — This guideline is a part of the English Wikipedia s Manual of Style. Use common sense in applying it; it will have occasional exceptions. Please ensure that any edits to this page reflect consensus. Shortcuts: WP:MSM MO … Wikipedia
Frequentation cinematographique — Fréquentation cinématographique La fréquentation cinématographique est la relation sociale entretenue entre un groupe d individus et le cinéma. Elle concerne la consommation de films dans les salles et sa fréquence. Elle se traduit par des… … Wikipédia en Français
Fréquentation Cinématographique — La fréquentation cinématographique est la relation sociale entretenue entre un groupe d individus et le cinéma. Elle concerne la consommation de films dans les salles et sa fréquence. Elle se traduit par des entrées au box office et son analyse… … Wikipédia en Français
Fréquentation des salles de cinéma en France — Fréquentation cinématographique La fréquentation cinématographique est la relation sociale entretenue entre un groupe d individus et le cinéma. Elle concerne la consommation de films dans les salles et sa fréquence. Elle se traduit par des… … Wikipédia en Français
La fréquentation des salles — Fréquentation cinématographique La fréquentation cinématographique est la relation sociale entretenue entre un groupe d individus et le cinéma. Elle concerne la consommation de films dans les salles et sa fréquence. Elle se traduit par des… … Wikipédia en Français
printmaking — /print may king/, n. the art or technique of making prints, esp. as practiced in engraving, etching, drypoint, woodcut or serigraphy. [1925 30; PRINT + MAKING] * * * Art form consisting of the production of images, usually on paper but… … Universalium
