Maths For Fun.

a) 142857 x 7 =999999.

b)142857 x 5 =714285.

c)12345679 x 8 =98765432.

d)98765432 x 9 =888888888.

e)3 + 3 + 3 =9;     9)333( =37.

f)2 + 2 +2 =6;       6)222( =37.

g)Perfect  numbers are the sum of their

proper divisors.

Eg: 6-divisors are: 1 + 2 +3 =6.

28–divisors are: 1 + 2 + 4 + 7 + 14 = 28.

h)142857 x 3 =428571; 142857 x 2 =285714.

i)What is the smallest integer, which, when

multiplied  by 7 gives a number consisting of

only 6’s?

Ans:95238.

j)7+7+7=21

Divide 777 by 21=37.

k)23   +  32  = 55

(2+3=5; 3+2=5)

34    +   45  =79

(3+4=7; 4+5=9)

52   +  25  = 77

(5+2=7; 2+5=7)

35  + 54  = 89

(3 +5=8; 5+4 =9)

Source: Collection.

 

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