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2. Positional notation - Wikipedia

   en.wikipedia.org/wiki/Positional_notation

   Place values are the number of the base raised to the nth power, where n is the number of other digits between a given digit and the radix point. If a given digit is on the left hand side of the radix point (i.e. its value is an integer ) then n is positive or zero; if the digit is on the right hand side of the radix point (i.e., its value is ...

3. Base ten blocks - Wikipedia

   en.wikipedia.org/wiki/Base_ten_blocks

   Dienes blocks in use. Base ten blocks, also known as Dienes blocks after popularizer Zoltán Dienes (Hungarian: [ˈdijɛnɛʃ]), are a mathematical manipulative used by students to practice counting and elementary arithmetic and develop number sense in the context of the decimal place-value system as a more concrete and direct representation than written Hindu–Arabic numerals.

4. List of numeral systems - Wikipedia

   en.wikipedia.org/wiki/List_of_numeral_systems

   A form of unary notation called Church encoding is used to represent numbers within lambda calculus. Some email spam filters tag messages with a number of asterisks in an e-mail header such as X-Spam-Bar or X-SPAM-LEVEL. The larger the number, the more likely the email is considered spam. 10: Bijective base-10: To avoid zero: 26: Bijective base-26

5. Number - Wikipedia

   en.wikipedia.org/wiki/Number

   In this base 10 system, the rightmost digit of a natural number has a place value of 1, and every other digit has a place value ten times that of the place value of the digit to its right. In set theory, which is capable of acting as an axiomatic foundation for modern mathematics, [34] natural numbers can be represented by classes of equivalent ...

6. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   A subtraction problem such as is solved by borrowing a 10 from the tens place to add to the ones place in order to facilitate the subtraction. Subtracting 9 from 6 involves borrowing a 10 from the tens place, making the problem into +. This is indicated by crossing out the 8, writing a 7 above it, and writing a 1 above the 6.

7. Cracker Barrel apologizes after refusing to serve students ...

   www.aol.com/cracker-barrel-apologizes-refusing...

   Cracker Barrel has apologized after its Waldorf, Maryland, restaurant refused to serve a group of students with special needs last week. The Lebanon, Tennessee-based restaurant chain said that its ...