Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.

Oct 29, 2025 · Simple online calculator with memory functions similar to a basic handheld calculator. Free simple calculator for adding, subtracting, multiplying, dividing.

Free math problem solver answers your homework questions with step-by-step explanations.

Sep 24, 2025 · The Rule of 72 is a straightforward formula that provides a quick-and-dirty approximation of how long it will take for an investment to double in value assuming a fixed annual rate of return.

How much are 72 inches in feet? 72 inches equal 6.0 feet (72in = 6.0ft). Converting 72 in to ft is easy. Simply use our calculator above, or apply the formula to change the length 72 in to ft.

72 is the sum between 60 and 12, the former being the second unitary perfect number before 6 (and the latter the smallest of only two sublime numbers). More specifically, twelve is also the number of …

It means that 72 is completely divisible by all these numbers. Apart from these, 72 also has negative factors that can be listed as, -1, -2, -3, -4, -6, -8, -9, -12, -18, -24, -36 and -72. For negative factors, …

The meaning of the number 72: How is 72 spell, written in words, interesting facts, mathematics, computer science, numerology, codes. 72 in Roman Numerals and images.

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IR-2025-128, Dec. 29, 2025 — The Internal Revenue Service today announced that the optional standard mileage rate for business use of automobiles will increase by 2.5 cents in 2026.