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Pandigital strings that end in $0$ and available to mental arithmetic?

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#recreational-mathematics #mental-arithmetic
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Why does this method for finding the square root of a number work?

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#number-theory #radicals #mental-arithmetic
6.4k
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How can I easily double any size number in my head?

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#probability #soft-question #arithmetic #mental-arithmetic
1.3k
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Multiplying very small numbers without the use of a calculator

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#arithmetic #mental-arithmetic
94
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How to multiply any number with decimal number

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#arithmetic #mental-arithmetic
1.3k
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Is there an easy way to multiply two 2-digit numbers that have flipped digits?

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#mental-arithmetic
1.9k
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Mixture and Alligation:::

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#arithmetic #mental-arithmetic
211
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Is there a quick way of finding the coefficients in an expression like $(ax^3+bx^2+cx+d)^3$?

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#algebra-precalculus #polynomials #binomial-coefficients #binomial-theorem #mental-arithmetic
57
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Approximate this fraction (simple arithmetic)

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#algebra-precalculus #arithmetic #mental-arithmetic
482
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Trick for calculating the 5th order derivative of $(2x^3+1)e^{x^2}$ evaluated at $0$

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#calculus #derivatives #taylor-expansion #binomial-coefficients #mental-arithmetic
153
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Can you propose any hack for remembering multiplication tables from $13-19$?

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#arithmetic #mental-arithmetic
176
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Does practicing mental math increase mathematical intuition?

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#soft-question #learning #mental-arithmetic
79
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How to quickly mentally calculate large powers for a single digit?

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#exponentiation #mental-arithmetic
25
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Expected Length of Walk on Truncated Icosahedron

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#graph-theory #expected-value #random-walk #polyhedra #mental-arithmetic
227
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Are there human integrators?

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#soft-question #mental-arithmetic

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