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2. Cistercian numerals - Wikipedia

   en.wikipedia.org/wiki/Cistercian_numerals

   Download as PDF; Printable version; ... 1 in units place, 2 in tens place (20), 3 in hundreds place (300), 4 in thousands place (4,000), then compound numbers 5,555 ...

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. Wikipedia, the free encyclopedia

   en.wikipedia.org/wiki/Main_Page

   Download QR code; Print/export Download as PDF; Printable version; In other projects Wikimedia Commons; ... Free textbooks and manuals. Wikidata Free knowledge base.

5. 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 ...

6. 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.

7. Number line - Wikipedia

   en.wikipedia.org/wiki/Number_line

   The order of the natural numbers shown on the number line. A number line is a graphical representation of a straight line that serves as spatial representation of numbers, usually graduated like a ruler with a particular origin point representing the number zero and evenly spaced marks in either direction representing integers, imagined to extend infinitely.

8. 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.

9. 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 ...