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Hindu-Arabic numerals, set of 10 symbols—1, 2, 3, 4, 5, 6, 7, 8, 9, 0—that represent numbers in the decimal number system. They originated in India in the 6th or 7th century and were introduced to Europe through the writings of Middle Eastern mathematicians, especially al-Khwarizmi and al-Kindi, about the 12th century.

The number shape system is a memory technique that can be used to memorize short numbers or as a peg list. It works by associating the shapes of numbers to pictures. For example, if you want to remember the number 2, you could picture a swan, because 2 looks like a swan.

0:06 3:38 How to Remember Numbers | Memory Techniques - YouTube YouTube Start of suggested clip End of suggested clip Whatever you decide. Make it what you always use for your rhyme. Schemes. Three can be a tree. FiveMoreWhatever you decide. Make it what you always use for your rhyme. Schemes. Three can be a tree. Five can be a beehive. Or someone doing a jive dance. Seven can be heaven. Nine can be a glass of wine.

0:14 3:31 Learn the Mnemonic Major System with Mnemonics - YouTube YouTube Start of suggested clip End of suggested clip Sounds we'll use a narwhal. Number three is replaced by m. Sounds we have a manatee. Number four isMoreSounds we'll use a narwhal. Number three is replaced by m. Sounds we have a manatee. Number four is replaced by r. Sounds we'll use a raccoon. Number five by l. Sounds let's use a lion.

0:06 3:38 How to Remember Numbers | Memory Techniques - YouTube YouTube Start of suggested clip End of suggested clip Whatever you decide. Make it what you always use for your rhyme. Schemes. Three can be a tree. FiveMoreWhatever you decide. Make it what you always use for your rhyme. Schemes. Three can be a tree. Five can be a beehive. Or someone doing a jive dance. Seven can be heaven. Nine can be a glass of wine.

A common example is how children remember the alphabet by singing the ABCs. The first letter of each word is combined into a new word. For example: VIBGYOR (or ROY G BIV) for the colours of the rainbow or HOMES (Lake Huron, Lake Ontario, Lake Michigan, Lake Erie, Lake Superior) the Great Lakes.

Here it is: ing to this, the shapes of the numbers was derived from a notation where for each numeral contains its own number of angles.

The average digit span for normal adults without error is seven plus or minus two. However, memory span can be expanded dramatically - in one case to 80 digits - by learning a sophisticated mnemonic system of recoding rules by which substrings of 5 to 10 digits are translated into one new chunk.

Examples of mnemonics include: Setting the ABCs to music to memorize the alphabet. Using rhymes to remember rules of spelling like "i before e except after c" Forming sentences out of the first letter of words in order (acrostics), such as "Please Excuse My Dear Aunt Sally," to remember the order of operations in algebra.