Show I M MULTIPLY U ON YOUR FINGERS Method Is An Invention of a Polish Mathematician Serve Mathematician Serve as Calculating Calculating Cal Cal- Machine A French magazine describes an musing Amusing method of learning and remembering re- re the harder part of or the multiplication table The method is there lere stated to be an Invention of M. M a Polish mathematician He Ic has discovered a way of making the he fingers serve as a calculating machine machine mahine ma- ma chine hine to obtain the products of the numbers umbers from 6 to 10 and also of the series erics of numbers from 11 to 15 and from om 16 to 20 both inclusive For the first series series series-G G 7 S 8 9 10 10 fingers and thumbs are numbered the numbers umbers running from 6 on the thumb to o 10 on the little finger of each hand Now ow in order to multiply the number on n one hand by the number on another another anther an an- other ther finger we put the two fingers together together together to to- gether one on each hand In finding the ie product we count the two joined fingers and all above them and thus get et the number of tens to get the units nits we multiply the number of fingers fingers fin fin- gers jers below the joined fingers on one hand land by the number below on the other ther The rule Is a little different for the products of the series 11 12 13 14 15 The fingers of the factors are marked as s before except that the thumbs are arenow arenow now ow 11 and the little fingers 15 16 Join Joins as s before the fingers to be multiplied Then hen for lOs add together the the joined fingers and all above them and also add dd For the units multiply the jOined finger together with those above bovo it on one hand by the joined finger nger and ana those above on the other For the next series of 17 7 18 IS 19 20 the thumbs are each 16 and nd the little fingers 20 Join the fingers which are to be multiplied co count nt the fingers which are joined as asand 2 and all above to get the number of ofOs Os and add To this add the product of the fingers below those joined as In the first case Multiply on Fingers Perhaps the latter cases of this curious urious little trick will be more Interesting in in- than useful but the first series eries will at times be an aid to everybody every every- body ody who Is now and then bothered in his lis recollection of the multiplication table able A little experimenting will vIll show how that the whole device is simpler in n practise than in description Reference Reference Ref- Ref rence to the cut will simplify the study tudy of these rules |