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2. 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.

3. Brain Age: Train Your Brain in Minutes a Day! - Wikipedia

   en.wikipedia.org/wiki/Brain_Age:_Train_Your_Brain...

   Calculations × 20 presents the player with 20 simple calculation equations that includes addition, subtraction, and multiplication. On the top screen are the problems which scroll up as answered whether right or wrong, while the touch screen is used to write out the answer. This test is also available in the training section.

4. Arithmetic - Wikipedia

   en.wikipedia.org/wiki/Arithmetic

   A similar technique is utilized for subtraction: it also starts with the rightmost digit and uses a "borrow" or a negative carry for the column on the left if the result of the one-digit subtraction is negative. [67] A basic technique of integer multiplication employs repeated addition.

5. Subtraction - Wikipedia

   en.wikipedia.org/wiki/Subtraction

   Subtraction (which is signified by the minus sign −) is one of the four arithmetic operations along with addition, multiplication and division. Subtraction is an operation that represents removal of objects from a collection. [ 1 ]

6. Additive inverse - Wikipedia

   en.wikipedia.org/wiki/Additive_inverse

   In mathematics, the additive inverse of an element x, denoted -x, [1] is the element that when added to x, yields the additive identity, 0 (zero). [2] In the most familiar cases, this is the number 0, but it can also refer to a more generalized zero element.

7. Elementary algebra - Wikipedia

   en.wikipedia.org/wiki/Elementary_algebra

   In mathematics, a basic algebraic operation is any one of the common operations of elementary algebra, which include addition, subtraction, multiplication, division, raising to a whole number power, and taking roots (fractional power). [6] These operations may be performed on numbers, in which case they are often called arithmetic operations.