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2. Base ten blocks - Wikipedia

   en.wikipedia.org/wiki/Base_ten_blocks

   Wooden Dienes blocks in units of 1, 10, 100 and 1000 Plastic 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 ...

3. Positional notation - Wikipedia

   en.wikipedia.org/wiki/Positional_notation

   Download as PDF; Printable version; ... or simply place value, ... a digit has only one value: I means one, X means ten and C a hundred ...

4. Counting rods - Wikipedia

   en.wikipedia.org/wiki/Counting_rods

   The value of a number depends on its physical position on the counting board. A 9 at the rightmost position on the board stands for 9. Moving the batch of rods representing 9 to the left one position (i.e., to the tens place) gives 9[] or 90. Shifting left again to the third position (to the hundreds place) gives 9[][] or 900.

5. Wikipedia, the free encyclopedia

   en.wikipedia.org/wiki/Main_Page

   Download as PDF; Printable version; ... Free textbooks and manuals. Wikidata Free knowledge base. Wikinews ... Bahasa Indonesia; Bahasa Melayu;

6. Decimal separator - Wikipedia

   en.wikipedia.org/wiki/Decimal_separator

   In mathematics and computing, a radix point or radix character is a symbol used in the display of numbers to separate the integer part of the value from its fractional part. In English and many other languages (including many that are written right-to-left), the integer part is at the left of the radix point, and the fraction part at the right ...

7. Subtraction - Wikipedia

   en.wikipedia.org/wiki/Subtraction

   The American method corrects for the increase of ten by reducing the digit in the minuend's hundreds place by one. That is, the 7 is struck through and replaced by a 6. The subtraction then proceeds in the hundreds place, where 6 is not less than 5, so the difference is written down in the result's hundred's place. We are now done, the result ...