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2. 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 picture 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.

3. Third grade - Wikipedia

   en.wikipedia.org/wiki/Third_grade

   Third grade (also 3rd Grade or Grade 3) is the third year of formal or compulsory education. It is the third year of primary school . Children in third grade are usually 8–9 years old.

4. Number Munchers - Wikipedia

   en.wikipedia.org/wiki/Number_Munchers

   Number Munchers is an educational video game and a spin-off of Word Munchers.It was released by MECC for Apple II in 1986, then MS-DOS and Mac in 1990. The concept of the game was designed by R. Philip Bouchard, who also designed The Oregon Trail.

5. Palindromic number - Wikipedia

   en.wikipedia.org/wiki/Palindromic_number

   All palindromic numbers with an even number of digits are divisible by 11. [1] There are 90 palindromic numbers with three digits (Using the rule of product: 9 choices for the first digit - which determines the third digit as well - multiplied by 10 choices for the second digit):

6. Arithmetic - Wikipedia

   en.wikipedia.org/wiki/Arithmetic

   Different types of numbers on a number line. Integers are black, rational numbers are blue, and irrational numbers are green. The main kinds of numbers employed in arithmetic are natural numbers, whole numbers, integers, rational numbers, and real numbers. [12] The natural numbers are whole numbers that start from 1 and go to infinity.

7. Triangular number - Wikipedia

   en.wikipedia.org/wiki/Triangular_number

   For example, the third triangular number is (3 × 2 =) 6, the seventh is (7 × 4 =) 28, the 31st is (31 × 16 =) 496, and the 127th is (127 × 64 =) 8128. The final digit of a triangular number is 0, 1, 3, 5, 6, or 8, and thus such numbers never end in 2, 4, 7, or 9. A final 3 must be preceded by a 0 or 5; a final 8 must be preceded by a 2 or 7.