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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. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    For example, subtraction is the inverse of addition since a number returns to its original value if a second number is first added and subsequently subtracted, as in + =. Defined more formally, the operation " ⋆ {\displaystyle \star } " is an inverse of the operation " ∘ {\displaystyle \circ } " if it fulfills the following condition: t ⋆ ...

  4. List of set identities and relations - Wikipedia

    en.wikipedia.org/wiki/List_of_set_identities_and...

    Set subtraction complexity: To manage the many identities involving set subtraction, this section is divided based on where the set subtraction operation and parentheses are located on the left hand side of the identity.

  5. Period (school) - Wikipedia

    en.wikipedia.org/wiki/Period_(school)

    Lunch periods in high school could be up to 240 minutes long. A free period in a college is a time period that a student is not enrolled in a class. During the free period, students are completely free of adult supervision and could do whatever they want that complies to the campus rules and the law.

  6. School meal - Wikipedia

    en.wikipedia.org/wiki/School_meal

    A school meal (whether it is a breakfast, lunch, or evening meal) is a meal provided to students and sometimes teachers at a school, typically in the middle or beginning of the school day. Countries around the world offer various kinds of school meal programs , and altogether, these are among the world's largest social safety nets . [ 1 ]

  7. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    In a sense, subtraction is the inverse of addition. That is, c = a − b if and only if c + b = a. In words: the difference of two numbers is the number that gives the first one when added to the second one. Subtraction follows several important patterns. It is anticommutative, meaning that changing the order changes the sign of the answer.

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