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  2. Chisanbop - Wikipedia

    en.wikipedia.org/wiki/Chisanbop

    The Chisanbop system. When a finger is touching the table, it contributes its corresponding number to a total. Chisanbop or chisenbop (from Korean chi (ji) finger + sanpŏp (sanbeop) calculation [1] 지산법/指算法), sometimes called Fingermath, [2] is a finger counting method used to perform basic mathematical operations.

  3. Casting out nines - Wikipedia

    en.wikipedia.org/wiki/Casting_out_nines

    A trick to learn to add with nines is to add ten to the digit and to count back one. Since we are adding 1 to the tens digit and subtracting one from the units digit, the sum of the digits should remain the same. For example, 9 + 2 = 11 with 1 + 1 = 2.

  4. Twenty-One Card Trick - Wikipedia

    en.wikipedia.org/wiki/Twenty-One_Card_Trick

    Mathematical explanation of the Twenty-one card trick with 27 cards: In each step, the cards are dealt into three piles. The piles are accumulated with the pile containing the target card (shaded yellow and labelled with the step number) put in the middle. After three steps, the middle card (*) is the one in all chosen piles.

  5. Booking.com could cut jobs as part of reorganization plan - AOL

    www.aol.com/news/booking-com-parent-cut-jobs...

    (Reuters) -Online travel agency Booking.com could cut jobs as part of a review of its organizational structure, it said on Saturday. The company, a unit of Booking Holdings, said in an emailed ...

  6. Mortgage rates stay flat as Trump’s second term comes into ...

    www.aol.com/finance/mortgage-rates-stay-flat...

    Mortgage rates stalled an upward rise this week as financial markets adjusted to a second Trump presidency. The average 30-year mortgage rate was essentially unchanged at 6.78% for the week ...

  7. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    Setting up for Division Division in the Trachtenberg System is done much the same as in multiplication but with subtraction instead of addition. Splitting the dividend into smaller Partial Dividends, then dividing this Partial Dividend by only the left-most digit of the divisor will provide the answer one digit at a time.

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