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2. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   Elementary arithmetic is a branch of mathematics involving addition, subtraction, multiplication, and division. Due to its low level of abstraction , broad range of application, and position as the foundation of all mathematics, elementary arithmetic is generally the first branch of mathematics taught in schools.

3. 24 (puzzle) - Wikipedia

   en.wikipedia.org/wiki/24_(puzzle)

   The original version of 24 is played with an ordinary deck of playing cards with all the face cards removed. The aces are taken to have the value 1 and the basic game proceeds by having 4 cards dealt and the first player that can achieve the number 24 exactly using only allowed operations (addition, subtraction, multiplication, division, and parentheses) wins the hand.

4. Arithmetic - Wikipedia

   en.wikipedia.org/wiki/Arithmetic

   Counting is a type of repeated addition in which the number 1 is continuously added. [46] Subtraction is the inverse of addition. In it, one number, known as the subtrahend, is taken away from another, known as the minuend. The result of this operation is called the difference. The symbol of subtraction is . [47]

5. Recall of facts - Wikipedia

   en.wikipedia.org/wiki/Recall_of_facts

   Helping children learn the basic facts is an important goal in the Everyday Mathematics Curriculum. Most children should have developed an automatic recall of the basic addition and subtraction facts by the end of the second grade. They should also know most of their 1, 2, 5, and 10 multiplication facts by this time.

6. Keisan Game - Wikipedia

   en.wikipedia.org/wiki/Keisan_Game

   This particular game focuses on the basics of addition (たしざん) and subtraction (ひきざん), with one and two digits only. As a video game primarily meant for educational purposes, there is very little variety between the four modes of the game. Half of the modes are for addition, while the other half are for subtraction.

7. Numeracy - Wikipedia

   en.wikipedia.org/wiki/Numeracy

   Basic numeracy skills consist of comprehending fundamental arithmetical operations like addition, subtraction, multiplication, and division. For example, if one can understand simple mathematical equations such as 2 + 2 = 4, then one would be considered to possess at least basic numeric knowledge.