multiplication table children's song

Nine nine leftover method mnemonic table:

Primary school students learn the "small nine-nine-nine" mnemonic, is from "one one get one" start to "nine-nine-eighty-one" so far, but in the ancient times is reversed from "nine-nine-eighty-one" start to "two two get four" stop. In ancient times, it is the other way around, from "nine hundred and ninety-one", to "two two get four" stop. Since the first two words of the mnemonic are "九九", people shortened it to "小九九". It was not until the 13th and 14th centuries that it was reversed like this: "One by one? Ninety-nine eighty-one".

Extended information:

The characteristics of the table of ninety-nine

1. nine numbers from one to nine.

2, the table contains multiplication of exchangeable, so only eight, nine, seventy-two, do not need "nine, eight, seventy-two", nine times nine has 81 sets of products, the table only needs 45 products. The Ming dynasty bead counting also used 81 groups of products of the nine-nine table. 45 items of the nine-nine table is called the small nine-nine, 81 items of the nine-nine table is called the big nine-nine.

3, the ancient world's shortest multiplication table. Maya multiplication table must be 190 items, Babylonian multiplication table must be 1770 items, Egypt, Greece, Rome, India and other countries multiplication table must be infinite number of items; nine-nine table only 45/81 items.

4, read aloud with rhythm, easy to memorize the whole table.

5. The table has existed for at least three thousand years. From the Spring and Autumn and Warring States Periods, it was used in calculations, and in the Ming Dynasty, it was improved and used on the abacus. Nine-nine table is also the basic skills of elementary school arithmetic.