Who said mathematics is boring? With this game, multiply two- and three-digit numbers will be simple ... and fun. We teach you a Japanese trick that fascinates young and old. You only need a sheet of paper and a pen or pencil. Pay attention to these instructions. How is the Japanese trick to multipl
Who said mathematics is boring? With this game, multiply two- and three-digit numbers will be simple... and fun. We teach you a Japanese trick that fascinates young and old. You only need a sheet of paper and a pen or pencil. Pay attention to these instructions.
How is the Japanese trick to multiply large numbers
1. Suppose we want to multiply 22x21 ... Each of the numbers symbolizes a line. First we look at the number on the left: a 2. We draw two parallel lines slightly inclined ... And since the next number is 2, we draw two more lines, below the previous ones and separated by a space. So:
2. Now we will look at the following numbers. Now we have another 2. We draw two lines that cut the previous ones. And now we have the number 1. We draw another line, parallel to the previous two lines and also cut the first ones we did ... So:
3. Now let's make the intersections in each of the corners, to count the points where the intersections intersect. lines. First we count the points where the lines intersect in the lower right corner ...
4. Then we count the points where the lines in the upper right corner intersect ... and point the number.
5. Now comes the turn of the upper left corner ...
6. And we also count the points where the lines in the lower left corner intersect ...
7. The figure that gives us is the one that you can read respecting the order, from top left to the right, counterclockwise. The first number would be 4. The second, the sum of the two numbers left on this diagonal (4 and 2), would be 6. The last number, the number 1.
8. To multiply three-digit numbers is Similary. First you draw the lines of the number on the left, leaving spaces of separation between each number ... And then cut these lines with the lines of the following numbers (the number on the right):
9. Now you count the intersections in the bottom corner left (2). Those in the upper left corner: 1. Now we add the intersections of the medium to the right (2) and those of the middle to the bottom (2). A total of 4.
10. Count now The intersection of the upper medium and the middle of the left. They give a total of 3:
11. You only have to add the intersections of the center, and they give 5:
12. The result? Place the numbers in order, from left to right ...