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  2. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    Since 9 = 10 − 1, to multiply a number by nine, multiply it by 10 and then subtract the original number from the result. For example, 9 × 27 = 270 − 27 = 243. This method can be adjusted to multiply by eight instead of nine, by doubling the number being subtracted; 8 × 27 = 270 − (2×27) = 270 − 54 = 216.

  3. Dyscalculia - Wikipedia

    en.wikipedia.org/wiki/Dyscalculia

    [9] [10] Estimates of the prevalence of dyscalculia range between 3 and 6% of the population. [9] [10] In 2015 it was established that 11% of children with dyscalculia also have attention deficit hyperactivity disorder (ADHD). [11] Dyscalculia has also been associated with Turner syndrome [12] and people who have spina bifida. [13]

  4. Elementary arithmetic - Wikipedia

    en.wikipedia.org/wiki/Elementary_arithmetic

    The sum of two numbers is unique; there is only one correct answer for a sums. [8] When the sum of a pair of digits results in a two-digit number, the "tens" digit is referred to as the "carry digit". [9] In elementary arithmetic, students typically learn to add whole numbers and may also learn about topics such as negative numbers and fractions.

  5. U2's Larry Mullen Jr. says dyscalculia affects his drumming ...

    www.aol.com/u2s-larry-mullen-jr-says-211302785.html

    Larry Mullen Jr. is opening up about a recent diagnosis. The drummer for U2, 63, revealed in an interview with Times Radio that he's been diagnosed with dyscalculia, which makes it challenging for ...

  6. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    If the top number is too small to subtract the bottom number from it, we add 10 to it; this 10 is "borrowed" from the top digit to the left, which we subtract 1 from. Then we move on to subtracting the next digit and borrowing as needed, until every digit has been subtracted.

  7. US asks court to reject TikTok's bid to stave off law that ...

    www.aol.com/news/us-asks-court-reject-delay...

    WASHINGTON (Reuters) -The Justice Department late on Wednesday asked a U.S. appeals court to reject an emergency bid by TikTok to temporarily block a law that would require its Chinese parent ...

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