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  2. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    Another method is multiplication by 3. A number of the form 10x + y has the same remainder when divided by 7 as 3x + y. One must multiply the leftmost digit of the original number by 3, add the next digit, take the remainder when divided by 7, and continue from the beginning: multiply by 3, add the next digit, etc.

  3. Percentage - Wikipedia

    en.wikipedia.org/wiki/Percentage

    The percent value can also be found by multiplying first instead of later, so in this example, the 50 would be multiplied by 100 to give 5,000, and this result would be divided by 1,250 to give 4%. To calculate a percentage of a percentage, convert both percentages to fractions of 100, or to decimals, and multiply them. For example, 50% of 40% is:

  4. Sleep - Wikipedia

    en.wikipedia.org/wiki/Sleep

    Hours of sleep recommended for each age group [91] Age and condition Sleep needs Newborns (0–3 months) 14 to 17 hours Infants (4–11 months) 12 to 15 hours Toddlers (1–2 years) 11 to 14 hours Preschoolers (3–4 years) 10 to 13 hours School-age children (5–12 years) 9 to 11 hours Teenagers (13–17 years) 8 to 10 hours

  5. Division (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Division_(mathematics)

    The division with remainder or Euclidean division of two natural numbers provides an integer quotient, which is the number of times the second number is completely contained in the first number, and a remainder, which is the part of the first number that remains, when in the course of computing the quotient, no further full chunk of the size of ...

  6. Sleep efficiency - Wikipedia

    en.wikipedia.org/wiki/Sleep_efficiency

    Sleep efficiency (SE) is the ratio between the time a person spends asleep, and the total time dedicated to sleep (i.e. both sleeping and attempting to fall asleep or fall back asleep). It is given as a percentage. [1] SE of 80% or more is considered normal/healthy with most young healthy adults displaying SE above 90%.

  7. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    An easily programmed alternative using only integer arithmetic is to calculate two large consecutive Fibonacci numbers and divide them. The ratio of Fibonacci numbers ⁠ F 25001 {\displaystyle F_{25001}} ⁠ and ⁠ F 25000 {\displaystyle F_{25000}} ⁠ , each over ⁠ 5000 {\displaystyle 5000} ⁠ digits, yields over ⁠ 10,000 {\displaystyle ...

  9. Second grade teacher, not student, called 911 to report ... - AOL

    www.aol.com/news/second-grader-called-911-report...

    Abundant Life is a K-12 school with around 390 students, according to the school website. The shooter was identified as Natalie Rupnow, who also went by the name Samantha, Barnes said.