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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. Manipulative (mathematics education) - Wikipedia

   en.wikipedia.org/wiki/Manipulative_(mathematics...

   Base Ten Blocks are a great way for students to learn about place value in a spatial way. The units represent ones, rods represent tens, flats represent hundreds, and the cube represents thousands. Their relationship in size makes them a valuable part of the exploration in number concepts.

4. List of numeral system topics - Wikipedia

   en.wikipedia.org/wiki/List_of_numeral_system_topics

   Korean numerals – Numbers in traditional Korean writing; Maya numerals – System used by the ancient Mayan civilization to represent numbers and dates; Prehistoric numerals – Numeral form used for counting; Roman numerals – Numbers in the Roman numeral system

5. List of types of numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_types_of_numbers

   Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number. Constructible number: A number representing a length that can be constructed using a compass and straightedge. Constructible numbers form a subfield of the field of algebraic numbers, and include the quadratic surds.

6. Balance puzzle - Wikipedia

   en.wikipedia.org/wiki/Balance_puzzle

   0, 2, 4, 10, 11 against 5, 8, 9, 12, 13; 0, 3, 8, 10, 12 against 6, 7, 9, 11, 13; If the scales are only off balance once, then it must be one of the coins 1, 2, 3—which only appear in one weighing. If there is never balance then it must be one of the coins 10–13 that appear in all weighings.

7. Sign-value notation - Wikipedia

   en.wikipedia.org/wiki/Sign-value_notation

   A sign-value notation represents numbers using a sequence of numerals which each represent a distinct quantity, regardless of their position in the sequence. Sign-value notations are typically additive, subtractive, or multiplicative depending on their conventions for grouping signs together to collectively represent numbers.