There's An Amazing Way To Do Multiplication That's Better Than How You Learned In School. ... Finally, you add all the products together. 140 + 21 equals 161, the product of 23 x 7.

Remember each cell in the grid represents a two-digit answer to a multiplication (product) made of a tens digit, and a units digit. End of image gallery. Back to top. Practise Napier’s method.

A long-standing puzzle seems to constrain how addition and multiplication relate to each other. A graduate student has gone further than anyone else in establishing the connection. In 1983 the ...