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  1. 4 - Wikipedia

    Approximately four weeks (4 times 7 days) to a lunar month (synodic month = 29.54 days). Thus the number four is universally an integral part of primitive sacred calendars.

  2. Math Calculator

    Aug 1, 2025 · Free online math calculator to add, subtract, multiply and divide positive and negative numbers. Online decimal calculator to find sum, difference and products of numbers.

  3. FOUR Definition & Meaning - Merriam-Webster

    The meaning of FOUR is a number that is one more than three. How to use four in a sentence.

  4. Full Screen Calculator - Online Calculator

    Perform calculations with ease using our Full Screen Calculator. With a simple and user-friendly interface, our calculator makes math tasks simpler and more efficient.

  5. 4 - Wiktionary, the free dictionary

    Dec 9, 2025 · A West Arabic numeral, ultimately from Indic numerals (compare Devanagari ४ (4)), a cursive form of four lines (to represent the number four) arranged in the shape of a cross (resembling …

  6. 4 (number) - New World Encyclopedia

    Some buildings skip floor 4 or replace the number with the letter "F," particularly in heavily Asian areas. In the NATO phonetic alphabet, the digit 4 is called "fower."

  7. Calculators | Calculator Soup

    Oct 27, 2025 · Browse calculators for banking, finance, loans, time and date, conversion, fractions, algebra and more.

  8. Math Solver

    Math At Microsoft Education, we believe every student deserves the opportunity to thrive. Make math accessible for learners with powerful, inclusive tools designed to unlock potential and build …

  9. four - Wiktionary, the free dictionary

    1 day ago · four (countable and uncountable, plural fours) (countable) The digit or figure 4; an occurrence thereof. (countable) Anything measuring four units, as length.

  10. Number 4 - Curious Math Facts and Interesting Properties

    Explore the curious properties of number 4, an even composite number composed of a single prime multiplied by itself. Includes mathematical info, prime factorization, divisors, bases and much more!