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Can you mentally Calculate :

21432 x 11 = ? [in 6 seconds]

See Below and Learn:

4216 x 11 = ?

#mathtricks #mathforkids #mathematics  ﻿
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Hehe﻿
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Nice one ﻿
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Find a sequence of maximal length consisting of non-zero integers in which the sum of any seven consecutive terms is positive and that of any eleven consecutive terms is negative.﻿
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Nice geometry problem.﻿
The last time when we reached 50 members, I posed a (seemingly) difficult question to solve (and in fact, no one did)!
Well, on this happy occasion of having reached 100 members, here's a difficult question for you to solve:

In the quadrilateral ABCD, find the values of X and Y!﻿
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:-)﻿
Enjoy it as much as I enjoyed.﻿
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Take a circle and randomly draw three diameters, thereby partitioning the circle into six sectors. What is the probability that two of the sectors have an area that is at least a quarter of the circle?﻿
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If AA x BB = CCDD
Find A+B+C+D

A, B, C and D are distinct non-zero numerals.﻿
Suppose N is the product of four distinct primes a, b, c and d, such that:

a + c = d

a(a + b + c + d) = c(d - b)

1 + bc + d = bd

Find N.

[From the 15th Irish MO]﻿