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  2. Premenstrual dysphoric disorder - Wikipedia

    en.wikipedia.org/wiki/Premenstrual_dysphoric...

    Premenstrual dysphoric disorder; Other names: Late luteal phase dysphoric disorder: Specialty: Psychiatry: Symptoms: Severe mood swings, depression, irritability, agitation, uneasiness, change in appetite, severe fatigue, anxiety, anger insomnia/hypersomnia, breast tenderness, decreased interest in usual social activities, reduced interest in sexual activity, difficulty in concentration

  3. Premenstrual syndrome - Wikipedia

    en.wikipedia.org/wiki/Premenstrual_syndrome

    Some supporters of PMS as a social construct believe PMDD and PMS to be unrelated issues: according to them, PMDD is a product of brain chemistry, and PMS is a product of culture, i.e. a culture-bound syndrome. Women are socially conditioned to expect PMS, or to at least know of its existence, and they therefore report their symptoms accordingly.

  4. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    492 is close to 500, which is easy to multiply by. Add and subtract 8 (the difference between 500 and 492) to get 492 -> 484, 500. Multiply these numbers together to get 242,000 (This can be done efficiently by dividing 484 by 2 = 242 and multiplying by 1000). Finally, add the difference (8) squared (8 2 = 64) to the result: 492 2 = 242,064

  5. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    Some of the algorithms Trachtenberg developed are ones for general multiplication, division and addition. Also, the Trachtenberg system includes some specialised methods for multiplying small numbers between 5 and 13. The section on addition demonstrates an effective method of checking calculations that can also be applied to multiplication.

  6. Symbolab - Wikipedia

    en.wikipedia.org/wiki/Symbolab

    Symbolab is an answer engine [1] that provides step-by-step solutions to mathematical problems in a range of subjects. [2] It was originally developed by Israeli start-up company EqsQuest Ltd., under whom it was released for public use in 2011.

  7. Mental calculator - Wikipedia

    en.wikipedia.org/wiki/Mental_calculator

    A mental calculator or human calculator is a person with a prodigious ability in some area of mental calculation (such as adding, subtracting, multiplying or dividing large numbers). In 2005, a group of researchers led by Michael W. O'Boyle, an American psychologist previously working in Australia and now at Texas Tech University , has used MRI ...

  8. Menstrual migraine - Wikipedia

    en.wikipedia.org/wiki/Menstrual_migraine

    The treatment and prognosis (if a disease gets better, worse or stays the same over time) [9] of migraine is affected by the comorbid disorders which may be present and/or the chance of getting comorbid disorders. [10] Asthma – Premenstrual asthma (PMA): This is when asthma symptoms get worse during the premenstrual period. This condition may ...

  9. Scientific calculator - Wikipedia

    en.wikipedia.org/wiki/Scientific_calculator

    TI's long-running TI-30 series being one of the most widely used scientific calculators in classrooms. Casio, Canon, and Sharp, produced their graphing calculators, with Casio's FX series (beginning with the Casio FX-1 in 1972 [9]). Casio was the first company to produce a Graphing calculator (Casio fx-7000G).